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For example, halogens get darker with increasing atomic weight – fluorine is nearly colorless, chlorine is yellow-green, bromine is red-brown, and iodine is dark gray/violet. Astatine is sometimes described as probably being a black solid (assuming it follows this trend), or as having a metallic appearance (if it is a metalloid or a metal).
Astatine has 23 nuclear isomers (nuclei with one or more nucleons – protons or neutrons – in an excited state). A nuclear isomer may also be called a " meta -state"; this means the system has more internal energy than the " ground state " (the state with the lowest possible internal energy), making the former likely to decay into the latter.
The dipyridine-astatine(I) cation, [At(C 5 H 5 N) 2] +, forms ionic compounds with perchlorate [25] (a non-coordinating anion [27]) and with nitrate, [At(C 5 H 5 N) 2]NO 3. [25] This cation exists as a coordination complex in which two dative covalent bonds separately link the astatine(I) centre with each of the pyridine rings via their ...
Astatine-228; Astatine-229 This page was last edited on 23 January 2021, at 05:47 (UTC). Text is available under the Creative Commons Attribution-ShareAlike 4.0 ...
Astatine monochloride [7] (AtCl) is made either by the direct combination of gas-phase astatine with chlorine or by the sequential addition of astatine and dichromate ion to an acidic chloride solution. Iodine monobromide (IBr) is made by the direct combination of the elements to form a dark red crystalline solid. It melts at 42 °C and boils ...
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Number of isomers [3] [4] Number of isomers including stereoisomers [3] [5] Molecular Formula Name of straight chain Synonyms 1 1 1 CH 4: methane: methyl hydride; natural gas 2 1 1 C 2 H 6: ethane: dimethyl; ethyl hydride; methyl methane 3 1 1 C 3 H 8: propane: dimethyl methane; propyl hydride 4 2 2 C 4 H 10: n-butane: butyl hydride ...