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Question

An element ‘X’ has mass number 4 and atomic number 2. Write the valency of this element. Will it react with other atoms of different elements?

Structure of the atom CBSE Class 9

CBSE, Class 9, Exam Idea, Science

July 12, 2024

Answer

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 other atoms of different elements.

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