Question

An element M has atomic number 2 and a mass number 4. Write the valency of this
element?​

Answer 1

We know that only valence electrons take part in bond formation with different atoms.In the atom of 'X' element there are only two electrons since atomic number is 2. Thus, K shell is fully filled for this atom. Hence,its valency is zero. It will not react with other atoms of different elements.

Answer 2

Answer:

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