Question

3. Give the total number of protons and elections present in the following

Al 3+, N 3-, Ca 2+, He, P 3-, H+, Ar​

Answer 1

Question 3.12 Consider the following species:

N3–, O2–, F–, Na+, Mg2+ and Al3+

(a) What is common in them?

(b) Arrange them in the order of increasing ionic radii.

Class XI Classification of Elements and Periodicity in Properties Page 93