valency of astatine
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The valency of astatine can vary depending on the compound it is involved in. Astatine belongs to group 17 of the periodic table, also known as the halogens. Like other halogens, astatine typically has a valency of -1 when forming compounds. However, astatine can also exhibit other oxidation states such as +1, +3, +5, or +7, although these are less common.
no of shell
Astatine has 6 electron shells or energy levels. The electron configuration of astatine is [Xe] 4f^14 5d^10 6s^2 6p^5, indicating that it has electrons occupying up to the 6th energy level or shell.