Question

Which of them is the hardest among the following group of elements?

• A. Group 2 A
• B. Group 1 A
• C. H₂
• D. All of these

Answer 1

The correct option is A

Group 2 A

The group 2 A elements have got 2 valence shell electrons leading to a stronger metallic bond compared to the rest. Hence group 2 A are harder compared to Group 1 A and $H_2$.