What is valency ? State the valency of sodium and magnesium ??

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Explanation:

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Valency of sodium is 1

Sodium has atomic number of 11. This means there are 11 proton in the nucleus. The first energy level can hold 8. Therefore the third energy level has 1 electron which is the valance electron.

Valency of magnesium is 2

Magnesium has an atomic number of 12. Following the logic used IN the previous example, there would be 2 valance electrons in the third energy level.

the solar system used to have much dust particles option no d

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