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.
The valency of an element is the number of electrons it can gain, lose, or share in order to achieve a stable electron configuration. Astatine (At) is a halogen element and is located in Group 17 of the periodic table, also known as Group VIIA or Group 7.
The valency of astatine can be determined by looking at its position in the periodic table. Since it is in Group 17, astatine has 7 valence electrons. Valence electrons are the electrons located in the outermost energy level or valence shell of an atom.
Based on its valence electron configuration, astatine has a valency of -1. This means that astatine can gain one electron to achieve a stable octet configuration (like the noble gas configuration) in its valence shell. By gaining one electron, astatine forms a negatively charged ion, known as an anion, with a 1- charge.
However, it is important to note that astatine is a very rare and highly radioactive element, and its chemical properties are not as extensively studied as other elements. Therefore, its valency and chemical behavior may not be fully understood.
The valency of an element refers to its combining capacity or the number of electrons it can gain, lose, or share when it forms chemical bonds with other atoms. To determine the valency of astatine (At), we need to look at its electron configuration.
Astatine (At) is a halogen element and belongs to Group 17 of the periodic table, along with fluorine (F), chlorine (Cl), bromine (Br), and iodine (I). Elements in Group 17 have seven valence electrons because they have seven electrons in their outermost energy level.
Astatine has the electron configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁵
From the electron configuration, we can see that astatine has seven valence electrons in its outermost energy level (5p⁵). Since astatine requires one more electron to achieve a stable octet (eight valence electrons), its valency would be -1.
Therefore, the valency of astatine (At) is -1.