Question

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Answer 1

Answer:

magnesium:-2

chlorine:-1

hydrogen:-1

sodium:-1

Explanation:

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Answer 2

• Magnesium- The distribution of electrons of the atom of a chemical element in an atomic orbital is represented by using the electron configuration. It shows the energy level and the orbitals (s, p, d, f) occupied by a certain number of electrons.
• chlorine-Valency is defined as the combining capacity of atoms or molecules. It is obtained from the number of electrons present in the outermost shell of an atom. The atomic number of chlorine is 17 and the electronic configuration is 2, 8, 7. Therefore, the valency of chlorine is 1.
• Hydrogen-Hydrogen is a unique atom, because it has only two spots in its outermost electron level. Helium has two electrons and exhibits the properties of a noble gas. Hydrogen's valence number is one, because it has only one valence electron and needs only one shared electron to fill its energy levels. This means it can bond with many elements.
• sodium-The electronic configuration of sodium can be written as 2, 8, 1. 2, 8, 1 electrons are distributed in the shells K, L, M respectively. Therefore, valence electron in sodium is 1 and it needs to lose 1 electron from the outermost orbit to attain octet. Hence, the valency of sodium is 1.