the atom or ion that has highest number of unpaired electron is a). Na+ b). F c).N d). O2- e). B

Dear student
a)Na+ has electronic configuration 1s²2s²2p⁶, ,hence it has no unpaired electron.

b)F has configuration 1s²2s²2p⁵, so it has one unpaired electron.


c)N has configuration 1s²2s²2p³, it has 3unpaired electrons,

d)O2- has configuration, 1s²2s²2p⁶, it has no unpaired electron.

e)B has configuration, 1s²2s²2p¹, it has one unpaired electron.


N thus has  maximum 3 unpaired electrons.
Regards