Question

What element has 3 electrons in the 2p sublevel?

Answer 1

Aufbau says that the sublevels fill 1s2, 2s2, 2p6. That would mean that you must have filled 1 and 2 s (=4) and 3 more.

Last I checked, 3 + 4 = 7. Which element has 7 electrons?

I'll give you a hint: its atomic number is 7. Another hint: its symbol is N.

Answer 2

The element should be nitrogen