Question

1S²,2S² 2p⁵
1S²,2S² 2P⁶,3S¹
1S²,2S² 2P⁶,3S² 3P⁶,4S²
a) which element shows different oxidation state?
b) which among those have hig electronegativity?
c) which element has greater atomic radius?​

Answer 1

Explanation:

a)3rd element show different oxidation states.

b) 1st element has higher electronegativity.

c) 3rd element has greatest atomic radii.