Question

Give the valency of the first ten elements.Why is the valency of the element Helium and neon zero?​

Answer 1

Answer:

Explanation:

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The first element helium (He) has only one shell and has maximum of two electrons in the only shell (K-shell) which it has. This means that the atoms of all the three elements donot have any range to either lose or gain electrons. Therefore they show zero valencies .

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Answer 2

Answer:

Hydrogen - 1

Helium - 2

Lithium - 1

Beryllium - 2

Boron - 3

Carbon - 4

Nitrogen - 3

Oxygen - 2

Fluorine - 1

Neon - 0

Valency of Helium is 0 because it has completed its doublet and does not need to loose or gain electrons.

Neon also has completed its octect so its valency is 0.