Question

Out of the elements H(1), Be(4), Na(11), and Mg(12).
1. Write the pair of elements having similar chemical properties.
2. State the group no. of each pair
3. Name the another element belonging to each of these groups.​

Answer 1

1.

(i) H and Na having similar chemical properties because there is one valence electrons in their outermost shell and also the reason is they belongs to the same group.

(ii) Be and Mg having similar chemical properties because there are two valence electrons in the outermost shell and they belongs to same group as well.

2.

H and Na belongs to group '1'

Be and Mg belongs to group '2'

3.

Li(Lithium - group '1')

Ca(Calsium - group '2')