Which of the following atom doesn't have its valency as one?

Lithium

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Hydrogen

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Magnesium

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Sodium

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Solution

The correct option is B Magnesium
Lithium, hydrogen, and sodium all generally exhibit a valency of one. On the other hand, magnesium has two electrons in its outermost shell and exhibits a valency of two.
So, the correct option is C.

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Similar questions

Which of the following polyatomic ions does not have a valency of −1?

Name the following :

(a) The element which does not contain any neutron m its nucleus.

(b) An element having valency 'zero'.

(d) Two atoms having the same number of protons and electrons but different number of neutrons.

(e) The shell closest to the nucleus of an atom.

How many valence electrons does a carbon atom have?

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