Which statement about the first ionization energies of nitrogen and oxygen atoms is correct?
a. IE1(N)<IE1(O) because oxygen has two paired electrons in its partly filled sublevel
b. IE1(N)>IE1(O) because oxygen has two paired electrons in its partly filled sublevel
c. IE1(N)<IE1(O) because oxygen loses an electron from a higher sublevel than nitrogen
d. IE1(N)>IE1(O) because oxygen loses an electron from a higher sublevel than nitrogen