Question

In the following table, the mass number and the atomic number of certain elements are given. Element A B. C D E Mass number 1 7 14 40 40 Atomic number 1 3 7 18 20 a) How many neutrons are present in B and D? b) What would be the valency of element C..hii​

Answer 1

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.

Answer 2

Answer:

Neutron in B and D is 4 and 22.

valency of element C is 6