Question

Which of the following properties of the alkaline earth metals increase from Be to Ba? (i) Atomic radius (ii) ionization energy (iii) Electropositive character

• A. (i) and (ii)
• B. (i) and (iii)
• C. (ii) and (iii)
• D. (i), (ii) and (iii)

Answer 1

The correct option is B (i) and (iii)

Atomic radius and electropositive character increase from top to bottom because the number of shells and atomic mass increases down the group.
Ionisation energy decreases from Be to Ba.
On going down the group atomic size gradually increases
consequently force of attraction between nucleus and electron decreases hence low energy is required to remove electron from outermost shell and hence ionisation energy down the group decreases.