Question

Which has max unpaired e among gd+3, sm+3, pm+2 and eu+2?

Answer 1

Gd has 7 unpaired electrons in it’s 4f subshell. In it’s ionized state, Gd+3, donates it’s 6s2 and 5d1 electrons for bonding, leaving the 4f shell intact. Tb, normally 4f9 configured, I believe, has a half filled 4f7 shell in the Tb+2 state, leading me to believe it has more unpaired electrons in comparison.

Answer 2

thanks for the points loser