Q. 95.0( 3 Votes )

In the following table, the mass number and the atomic number of certain elements are given:

(a) Select a pair of isobars from the above table.

(b) What would be the valency of element ‘B’ listed in the above table?

Answer :

a. Elements D and E are isobars as they have a same mass number but a different atomic number.

b. The atomic number of element B is 3. So its electronic configuration is 2, 1. Hence its valency is 1 as it has only 1 valence electron.

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