Talk:Astatine - Revision history

Sandbh: /* Density of fcc metallic At (conjectures) */

2024-01-24T02:10:18Z

Density of fcc metallic At (conjectures)

← Previous revision		Revision as of 02:10, 24 January 2024
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	metallic solids as a consequence of an emerging polarization catastrophe. As these polarizabilities increase monotonically proceeding down the halogen group, the estimated compressions necessary for metallization decrease monotonically" ({{doi\|10.1103/PhysRevLett.111.116404}}, p. 2). The polarizability for I is 32.9± atomic units and that for At is 42.2±4. On this basis the density of At is 42.2/32.9 x 7.83 (fcc I density) = 10.04 gm/cc. --- [[User:Sandbh\|Sandbh]] ([[User talk:Sandbh\|talk]]) 06:32, 13 January 2024 (UTC)		metallic solids as a consequence of an emerging polarization catastrophe. As these polarizabilities increase monotonically proceeding down the halogen group, the estimated compressions necessary for metallization decrease monotonically" ({{doi\|10.1103/PhysRevLett.111.116404}}, p. 2). The polarizability for I is 32.9± atomic units and that for At is 42.2±4. On this basis the density of At is 42.2/32.9 x 7.83 (fcc I density) = 10.04 gm/cc. --- [[User:Sandbh\|Sandbh]] ([[User talk:Sandbh\|talk]]) 06:32, 13 January 2024 (UTC)
	:At high pressure, wouldn't the interatomic distance be smaller because of volume compression? So I guess hypothetical fcc iodine density at standard pressure (if that state could persist) would be somewhat lower than 7.83 (not sure how much). But these are conjectural anyway. [[User:Double sharp\|Double sharp]] ([[User talk:Double sharp\|talk]]) 07:43, 14 January 2024 (UTC)		:At high pressure, wouldn't the interatomic distance be smaller because of volume compression? So I guess hypothetical fcc iodine density at standard pressure (if that state could persist) would be somewhat lower than 7.83 (not sure how much). But these are conjectural anyway. [[User:Double sharp\|Double sharp]] ([[User talk:Double sharp\|talk]]) 07:43, 14 January 2024 (UTC)

			From Arblaster (2018 p. 604):

			:"Hermann et al. 2013 have indicated that the correct room temperature structure is the metallic form and is probably face-centered cubic (cF4) with an estimated lattice parameter of 0.539 nm (Hermann 2014) which leads to the estimated crytallographic properties given in Table 85. The molar volume is notably lower than the range of 33.9 to 34.5 cm<sup>2</sup> mol<sup>–1</sup> estimated by Bonchev and Kamenska 1981 using the technique of information indices."

			They give a density of 8.91 gm/cc for At-210, and 8.95 for At-211. The molar volume is 23.6 cc/mol. --- [[User:Sandbh\|Sandbh]] ([[User talk:Sandbh\|talk]]) 02:09, 24 January 2024 (UTC)

			* Arblaster JW (ed.) 2018, ''Selected Values of the Crystallographic Properties of Elements,'' ASM International, Materials Park, Ohio
			* Hermann A 2014, Priv.Comm., 10 January
			--- [[User:Sandbh\|Sandbh]] ([[User talk:Sandbh\|talk]]) 02:09, 24 January 2024 (UTC)

Sandbh: /* Density of fcc metallic At (conjectures) */

2024-01-14T11:34:05Z

Density of fcc metallic At (conjectures)

← Previous revision		Revision as of 11:34, 14 January 2024
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	== Density of fcc metallic At (conjectures) ==		== Density of fcc metallic At (conjectures) ==

	'''1.''' Iodine at 53 GPa adopts a ~~metaliic~~ FCC structure, with a volume (Å/atom) of 19.91 ({{doi\|10.1103/physrevb.49.3725}}, p. 3727). Such a stucture has a packing efficiency of 74%.		'''1.''' Iodine at 53 GPa adopts a metallic FCC structure, with a volume (Å/atom) of 19.91 ({{doi\|10.1103/physrevb.49.3725}}, p. 3727). Such a stucture has a packing efficiency of 74%.

	The volume of one mole of such iodine atoms is 19.91 x 10<sup>–24</sup> x 6.022 x 10<sup>23</sup> = 11.99 cc.		The volume of one mole of such iodine atoms is 19.91 x 10<sup>–24</sup> x 6.022 x 10<sup>23</sup> = 11.99 cc.

Sandbh: /* Density of fcc metallic At (conjectures) */

2024-01-14T11:33:43Z

Density of fcc metallic At (conjectures)

← Previous revision		Revision as of 11:33, 14 January 2024
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	== Density of fcc metallic At (conjectures) ==		== Density of fcc metallic At (conjectures) ==

	'''1.''' Iodine at 53 GPa adopts a ~~metalic~~ FCC structure, with a volume (Å/atom) of 19.91 ({{doi\|10.1103/physrevb.49.3725}}, p. 3727). Such a stucture has a packing efficiency of 74%.		'''1.''' Iodine at 53 GPa adopts a metaliic FCC structure, with a volume (Å/atom) of 19.91 ({{doi\|10.1103/physrevb.49.3725}}, p. 3727). Such a stucture has a packing efficiency of 74%.

	The volume of one mole of such iodine atoms is 19.91 x 10<sup>–24</sup> x 6.022 x 10<sup>23</sup> = 11.99 cc.		The volume of one mole of such iodine atoms is 19.91 x 10<sup>–24</sup> x 6.022 x 10<sup>23</sup> = 11.99 cc.

Double sharp: /* Density of fcc metallic At (conjectures) */

2024-01-14T07:43:53Z

Density of fcc metallic At (conjectures)

← Previous revision		Revision as of 07:43, 14 January 2024
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	'''3.''' "From the known atomic or molecular dipole polarizabilities, we can estimate the atomic densities required to form		'''3.''' "From the known atomic or molecular dipole polarizabilities, we can estimate the atomic densities required to form
	metallic solids as a consequence of an emerging polarization catastrophe. As these polarizabilities increase monotonically proceeding down the halogen group, the estimated compressions necessary for metallization decrease monotonically" ({{doi\|10.1103/PhysRevLett.111.116404}}, p. 2). The polarizability for I is 32.9± atomic units and that for At is 42.2±4. On this basis the density of At is 42.2/32.9 x 7.83 (fcc I density) = 10.04 gm/cc. --- [[User:Sandbh\|Sandbh]] ([[User talk:Sandbh\|talk]]) 06:32, 13 January 2024 (UTC)		metallic solids as a consequence of an emerging polarization catastrophe. As these polarizabilities increase monotonically proceeding down the halogen group, the estimated compressions necessary for metallization decrease monotonically" ({{doi\|10.1103/PhysRevLett.111.116404}}, p. 2). The polarizability for I is 32.9± atomic units and that for At is 42.2±4. On this basis the density of At is 42.2/32.9 x 7.83 (fcc I density) = 10.04 gm/cc. --- [[User:Sandbh\|Sandbh]] ([[User talk:Sandbh\|talk]]) 06:32, 13 January 2024 (UTC)
	:At high pressure, wouldn't the interatomic distance be smaller because of volume compression? So I guess hypothetical fcc I density at standard pressure (if that state could persist) would be somewhat lower than 7.83 (not sure how much). But these are conjectural anyway. [[User:Double sharp\|Double sharp]] ([[User talk:Double sharp\|talk]]) 07:43, 14 January 2024 (UTC)		:At high pressure, wouldn't the interatomic distance be smaller because of volume compression? So I guess hypothetical fcc iodine density at standard pressure (if that state could persist) would be somewhat lower than 7.83 (not sure how much). But these are conjectural anyway. [[User:Double sharp\|Double sharp]] ([[User talk:Double sharp\|talk]]) 07:43, 14 January 2024 (UTC)

Double sharp: /* Density of fcc metallic At (conjectures) */

2024-01-14T07:43:14Z

Density of fcc metallic At (conjectures)

← Previous revision		Revision as of 07:43, 14 January 2024
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	'''3.''' "From the known atomic or molecular dipole polarizabilities, we can estimate the atomic densities required to form		'''3.''' "From the known atomic or molecular dipole polarizabilities, we can estimate the atomic densities required to form
	metallic solids as a consequence of an emerging polarization catastrophe. As these polarizabilities increase monotonically proceeding down the halogen group, the estimated compressions necessary for metallization decrease monotonically" ({{doi\|10.1103/PhysRevLett.111.116404}}, p. 2). The polarizability for I is 32.9± atomic units and that for At is 42.2±4. On this basis the density of At is 42.2/32.9 x 7.83 (fcc I density) = 10.04 gm/cc. --- [[User:Sandbh\|Sandbh]] ([[User talk:Sandbh\|talk]]) 06:32, 13 January 2024 (UTC)		metallic solids as a consequence of an emerging polarization catastrophe. As these polarizabilities increase monotonically proceeding down the halogen group, the estimated compressions necessary for metallization decrease monotonically" ({{doi\|10.1103/PhysRevLett.111.116404}}, p. 2). The polarizability for I is 32.9± atomic units and that for At is 42.2±4. On this basis the density of At is 42.2/32.9 x 7.83 (fcc I density) = 10.04 gm/cc. --- [[User:Sandbh\|Sandbh]] ([[User talk:Sandbh\|talk]]) 06:32, 13 January 2024 (UTC)
			:At high pressure, wouldn't the interatomic distance be smaller because of volume compression? So I guess hypothetical fcc I density at standard pressure (if that state could persist) would be somewhat lower than 7.83 (not sure how much). But these are conjectural anyway. [[User:Double sharp\|Double sharp]] ([[User talk:Double sharp\|talk]]) 07:43, 14 January 2024 (UTC)

Sandbh: /* Density of fcc metallic At (conjectures) */ new section

2024-01-13T06:32:19Z

Density of fcc metallic At (conjectures): new section

← Previous revision		Revision as of 06:32, 13 January 2024
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	:There are no experimentally determined values for them. Various predicted values have been published, but there are too many to list exhaustively and there's no reason to favor one source over another; thus they are not included in the article <sup>[[User:ComplexRational\|'''<span style="color:#0039a6">Complex</span>''']]</sup>/<sub>[[User talk:ComplexRational\|'''<span style="color:#000000">Rational</span>''']]</sub> 20:03, 7 October 2023 (UTC)		:There are no experimentally determined values for them. Various predicted values have been published, but there are too many to list exhaustively and there's no reason to favor one source over another; thus they are not included in the article <sup>[[User:ComplexRational\|'''<span style="color:#0039a6">Complex</span>''']]</sup>/<sub>[[User talk:ComplexRational\|'''<span style="color:#000000">Rational</span>''']]</sub> 20:03, 7 October 2023 (UTC)
	::The other thing is that most of the values in the literature are predictions for At<sub>2</sub>, and we don't know if condensed astatine is actually going to be diatomic. [[User:Double sharp\|Double sharp]] ([[User talk:Double sharp\|talk]]) 08:44, 11 October 2023 (UTC)		::The other thing is that most of the values in the literature are predictions for At<sub>2</sub>, and we don't know if condensed astatine is actually going to be diatomic. [[User:Double sharp\|Double sharp]] ([[User talk:Double sharp\|talk]]) 08:44, 11 October 2023 (UTC)

			== Density of fcc metallic At (conjectures) ==

			'''1.''' Iodine at 53 GPa adopts a metalic FCC structure, with a volume (Å/atom) of 19.91 ({{doi\|10.1103/physrevb.49.3725}}, p. 3727). Such a stucture has a packing efficiency of 74%.

			The volume of one mole of such iodine atoms is 19.91 x 10<sup>–24</sup> x 6.022 x 10<sup>23</sup> = 11.99 cc.

			Since the atomic weight of iodine is 126.9 this suggests a density of 0.74 x 126.9/11.99 = 7.83 gm/cc, compared to 4.93 gm/cc for ordinary iodine. Thus, the density from orthorhombic to fcc iodine increases 1.58 times.

			If this occurs for fcc astatine, it suggests a density of 6.2–6.5 x 1.58 = 10.03±0.24 gm/cc. The figure of 6.2–6.5 is from {{doi\|10.1021/j150609a021\|10.1021/j150609a021}}, pp. 1182, 1185).

			'''2.''' Another way to look at this is the metallization collapse that occurs when R/V = 1. Here, R = molar refractivity and V = molar volume. Pauling pointed out that the cube root of molar refractivity is tantamount to an approximate measure of the radius of the outermost valence electrons in the atom. [https://www.knowledgedoor.com/2/elements_handbook/orbital_radius.html The orbital radius of At] is 114.6 pm. Cubed, this yields an R value value of 15.05 cc which is ≈ to V. The density is then the atomic weight of At = 210 divided by the molar volume of 11.137 cc = 13.96 x 0.74 packing efficiency = 10.33 gm/cc.

			'''3.''' "From the known atomic or molecular dipole polarizabilities, we can estimate the atomic densities required to form
			metallic solids as a consequence of an emerging polarization catastrophe. As these polarizabilities increase monotonically proceeding down the halogen group, the estimated compressions necessary for metallization decrease monotonically" ({{doi\|10.1103/PhysRevLett.111.116404}}, p. 2). The polarizability for I is 32.9± atomic units and that for At is 42.2±4. On this basis the density of At is 42.2/32.9 x 7.83 (fcc I density) = 10.04 gm/cc. --- [[User:Sandbh\|Sandbh]] ([[User talk:Sandbh\|talk]]) 06:32, 13 January 2024 (UTC)

Praseodymium-141: Assessment: banner shell, Elements, Guild of Copy Editors, −Vital article (Rater)

2023-12-28T18:44:27Z

Assessment: banner shell, Elements, Guild of Copy Editors, −Vital article (Rater)

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	}}		}}
	{{WikiProject banner shell\|collapsed=yes\|1=		{{WikiProject banner shell\|class=FA\|collapsed=yes\|vital=yes\|1=
	{{WikiProject Elements\|~~class~~ = ~~FA\|importance=~~Mid}}		{{WikiProject Elements\|importance = Mid}}
	{{~~GOCE~~\|user=Allens\|date=17 February 2012 – 21 May 2012}}		{{WikiProject Guild of Copy Editors\|user=Allens\|date=17 February 2012 – 21 May 2012}}
	{{Vital article\|level=4\|topic=Science\|class = FA\|subpage=Physics}}
	}}		}}
	{{User:MiszaBot/config		{{User:MiszaBot/config

PrimeBOT: /* top */Task 24: banner removal following a TFD

2023-11-01T11:54:49Z

top: Task 24: banner removal following a TFD

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	{{WikiProject Elements\|class = FA\|importance=Mid}}		{{WikiProject Elements\|class = FA\|importance=Mid}}
	{{GOCE\|user=Allens\|date=17 February 2012 – 21 May 2012}}		{{GOCE\|user=Allens\|date=17 February 2012 – 21 May 2012}}
	{{WP1.0 \|class=FA \|WPCD=yes \|importance=Low}}
	{{Vital article\|level=4\|topic=Science\|class = FA\|subpage=Physics}}		{{Vital article\|level=4\|topic=Science\|class = FA\|subpage=Physics}}
	}}		}}

Double sharp: /* Melting and boiling points */

2023-10-11T08:44:36Z

Melting and boiling points

← Previous revision		Revision as of 08:44, 11 October 2023
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	:There are no experimentally determined values for them. Various predicted values have been published, but there are too many to list exhaustively and there's no reason to favor one source over another; thus they are not included in the article <sup>[[User:ComplexRational\|'''<span style="color:#0039a6">Complex</span>''']]</sup>/<sub>[[User talk:ComplexRational\|'''<span style="color:#000000">Rational</span>''']]</sub> 20:03, 7 October 2023 (UTC)		:There are no experimentally determined values for them. Various predicted values have been published, but there are too many to list exhaustively and there's no reason to favor one source over another; thus they are not included in the article <sup>[[User:ComplexRational\|'''<span style="color:#0039a6">Complex</span>''']]</sup>/<sub>[[User talk:ComplexRational\|'''<span style="color:#000000">Rational</span>''']]</sub> 20:03, 7 October 2023 (UTC)
			::The other thing is that most of the values in the literature are predictions for At<sub>2</sub>, and we don't know if condensed astatine is actually going to be diatomic. [[User:Double sharp\|Double sharp]] ([[User talk:Double sharp\|talk]]) 08:44, 11 October 2023 (UTC)

Lowercase sigmabot III: Archiving 2 discussion(s) to Talk:Astatine/Archive 2) (bot

2023-10-08T00:22:14Z

Archiving 2 discussion(s) to Talk:Astatine/Archive 2) (bot

← Previous revision		Revision as of 00:22, 8 October 2023
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	When solid, Cl, Br and I have orthorhombic crystalline structures. The volumes of the respective unit cells are 230.91, 262.1046 and 341.5684 cubic Å. The crystalline atomic radii are 0.99, 1.135 and 1.345 Å. If astatine instead has an (unmetallic) orthorhombic structure, its unit cell volume can be indicatively extrapolated using the cube of its predicted covalent atomic radius of 1.5 Å. Its crystalline atomic radius may be marginally larger due to intralayer bonding, as appears to occur in iodine, but I’ll ignore this possibility as I have no way of quantifying it. A straight line extrapolation (R-squared = 0.9989) of unit cell volume for Cl, Br, and I vs. the cube of atomic radius for Cl, Br, I and At indicates an atomic volume for At of 412.3276. There are eight atoms in an orthorhombic unit cell so that gives a density (from the above calcs for metallic astatine) of 278.96 x 10^(–23) grams/412.3276 cubic Å = 6.76 grams per cubic centimetre, noting it is likely to be less than this given stronger intralayer bonding. For comparison, the figure cited in the article is 6.35 ±0.15. [[User:Sandbh\|Sandbh]] ([[User talk:Sandbh\|talk]]) 03:16, 17 April 2015‎ (UTC)		When solid, Cl, Br and I have orthorhombic crystalline structures. The volumes of the respective unit cells are 230.91, 262.1046 and 341.5684 cubic Å. The crystalline atomic radii are 0.99, 1.135 and 1.345 Å. If astatine instead has an (unmetallic) orthorhombic structure, its unit cell volume can be indicatively extrapolated using the cube of its predicted covalent atomic radius of 1.5 Å. Its crystalline atomic radius may be marginally larger due to intralayer bonding, as appears to occur in iodine, but I’ll ignore this possibility as I have no way of quantifying it. A straight line extrapolation (R-squared = 0.9989) of unit cell volume for Cl, Br, and I vs. the cube of atomic radius for Cl, Br, I and At indicates an atomic volume for At of 412.3276. There are eight atoms in an orthorhombic unit cell so that gives a density (from the above calcs for metallic astatine) of 278.96 x 10^(–23) grams/412.3276 cubic Å = 6.76 grams per cubic centimetre, noting it is likely to be less than this given stronger intralayer bonding. For comparison, the figure cited in the article is 6.35 ±0.15. [[User:Sandbh\|Sandbh]] ([[User talk:Sandbh\|talk]]) 03:16, 17 April 2015‎ (UTC)

	== "Astitene" listed at [[Wikipedia:Redirects for discussion\|Redirects for discussion]] ==
	[[File:Information.svg\|30px]]
	A discussion is taking place to address the redirect [[:Astitene]]. The discussion will occur at [[Wikipedia:Redirects for discussion/Log/2021 April 21#Astitene]] until a consensus is reached, and readers of this page are welcome to contribute to the discussion. <!-- from Template:RFDNote --> –[[User:LaundryPizza03\|<b style="color:#77b">Laundry</b><b style="color:#fb0">Pizza</b><b style="color:#b00">03</b>]] ([[User talk:LaundryPizza03\|<span style="color:#0d0">d</span>]][[Special:Contribs/LaundryPizza03\|<span style="color:#0bf">c̄</span>]]) 17:50, 21 April 2021 (UTC)

	== Bombarding? ==

	Is "bombarding" really a scientific term that can be used at the end of the article, right at the end of the lead, before the subsections? [[User:FikaMedHasse\|FikaMedHasse]] ([[User talk:FikaMedHasse\|talk]]) 10:53, 11 November 2021 (UTC)
	:It's the standard term in this context, yes. [[User:DMacks\|DMacks]] ([[User talk:DMacks\|talk]]) 11:29, 11 November 2021 (UTC)

	Okay, thank you. I just found the phrase a bit comical. [[User:FikaMedHasse\|FikaMedHasse]] ([[User talk:FikaMedHasse\|talk]]) 11:37, 12 November 2021 (UTC)
	:Sometimes science adopts lay-language words and uses interesting shades of meaning or things that sound funny. In this case, an early ref is [[Enrico Fermi]]'s "Artificial Radioactivity produced by Neutron Bombardment" article from 1934 ([[doi:10.1098/rspa.1934.0168]]). [[List of unusual units of measurement]] is a good read. [[User:DMacks\|DMacks]] ([[User talk:DMacks\|talk]]) 16:34, 12 November 2021 (UTC)

	== More recent papers on At chemistry ==		== More recent papers on At chemistry ==

← Previous revision		Revision as of 11:54, 1 November 2023
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	{{WikiProject Elements\|class = FA\|importance=Mid}}		{{WikiProject Elements\|class = FA\|importance=Mid}}
	{{GOCE\|user=Allens\|date=17 February 2012 – 21 May 2012}}		{{GOCE\|user=Allens\|date=17 February 2012 – 21 May 2012}}
	{{WP1.0 \|class=FA \|WPCD=yes \|importance=Low}}
	{{Vital article\|level=4\|topic=Science\|class = FA\|subpage=Physics}}		{{Vital article\|level=4\|topic=Science\|class = FA\|subpage=Physics}}
	}}		}}

← Previous revision		Revision as of 00:22, 8 October 2023
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	When solid, Cl, Br and I have orthorhombic crystalline structures. The volumes of the respective unit cells are 230.91, 262.1046 and 341.5684 cubic Å. The crystalline atomic radii are 0.99, 1.135 and 1.345 Å. If astatine instead has an (unmetallic) orthorhombic structure, its unit cell volume can be indicatively extrapolated using the cube of its predicted covalent atomic radius of 1.5 Å. Its crystalline atomic radius may be marginally larger due to intralayer bonding, as appears to occur in iodine, but I’ll ignore this possibility as I have no way of quantifying it. A straight line extrapolation (R-squared = 0.9989) of unit cell volume for Cl, Br, and I vs. the cube of atomic radius for Cl, Br, I and At indicates an atomic volume for At of 412.3276. There are eight atoms in an orthorhombic unit cell so that gives a density (from the above calcs for metallic astatine) of 278.96 x 10^(–23) grams/412.3276 cubic Å = 6.76 grams per cubic centimetre, noting it is likely to be less than this given stronger intralayer bonding. For comparison, the figure cited in the article is 6.35 ±0.15. [[User:Sandbh\|Sandbh]] ([[User talk:Sandbh\|talk]]) 03:16, 17 April 2015‎ (UTC)		When solid, Cl, Br and I have orthorhombic crystalline structures. The volumes of the respective unit cells are 230.91, 262.1046 and 341.5684 cubic Å. The crystalline atomic radii are 0.99, 1.135 and 1.345 Å. If astatine instead has an (unmetallic) orthorhombic structure, its unit cell volume can be indicatively extrapolated using the cube of its predicted covalent atomic radius of 1.5 Å. Its crystalline atomic radius may be marginally larger due to intralayer bonding, as appears to occur in iodine, but I’ll ignore this possibility as I have no way of quantifying it. A straight line extrapolation (R-squared = 0.9989) of unit cell volume for Cl, Br, and I vs. the cube of atomic radius for Cl, Br, I and At indicates an atomic volume for At of 412.3276. There are eight atoms in an orthorhombic unit cell so that gives a density (from the above calcs for metallic astatine) of 278.96 x 10^(–23) grams/412.3276 cubic Å = 6.76 grams per cubic centimetre, noting it is likely to be less than this given stronger intralayer bonding. For comparison, the figure cited in the article is 6.35 ±0.15. [[User:Sandbh\|Sandbh]] ([[User talk:Sandbh\|talk]]) 03:16, 17 April 2015‎ (UTC)

	== "Astitene" listed at [[Wikipedia:Redirects for discussion\|Redirects for discussion]] ==
	[[File:Information.svg\|30px]]
	A discussion is taking place to address the redirect [[:Astitene]]. The discussion will occur at [[Wikipedia:Redirects for discussion/Log/2021 April 21#Astitene]] until a consensus is reached, and readers of this page are welcome to contribute to the discussion. <!-- from Template:RFDNote --> –[[User:LaundryPizza03\|<b style="color:#77b">Laundry</b><b style="color:#fb0">Pizza</b><b style="color:#b00">03</b>]] ([[User talk:LaundryPizza03\|<span style="color:#0d0">d</span>]][[Special:Contribs/LaundryPizza03\|<span style="color:#0bf">c̄</span>]]) 17:50, 21 April 2021 (UTC)

	== Bombarding? ==

	Is "bombarding" really a scientific term that can be used at the end of the article, right at the end of the lead, before the subsections? [[User:FikaMedHasse\|FikaMedHasse]] ([[User talk:FikaMedHasse\|talk]]) 10:53, 11 November 2021 (UTC)
	:It's the standard term in this context, yes. [[User:DMacks\|DMacks]] ([[User talk:DMacks\|talk]]) 11:29, 11 November 2021 (UTC)

	Okay, thank you. I just found the phrase a bit comical. [[User:FikaMedHasse\|FikaMedHasse]] ([[User talk:FikaMedHasse\|talk]]) 11:37, 12 November 2021 (UTC)
	:Sometimes science adopts lay-language words and uses interesting shades of meaning or things that sound funny. In this case, an early ref is [[Enrico Fermi]]'s "Artificial Radioactivity produced by Neutron Bombardment" article from 1934 ([[doi:10.1098/rspa.1934.0168]]). [[List of unusual units of measurement]] is a good read. [[User:DMacks\|DMacks]] ([[User talk:DMacks\|talk]]) 16:34, 12 November 2021 (UTC)

	== More recent papers on At chemistry ==		== More recent papers on At chemistry ==