Question

the s and p sublevels of an atom of an element in period 3 are filled with electrons. Which orbitals are filled in this atom?

Answer 1

s sublevel = s orbital p sublevel= p orbitals the level tells you which orbitals exactly,
so level 3,
sub level p = 3p orbitals

Answer 2

1s,2s,2p,3s,3p

Step-by-step explanation:

If an element is in period 3, then it has three energy levels. For the 3s and 3p orbitals to be filled, then the inner orbitals must have been filled before. That is 1s, 2s,2p, are all previously filled with electrons before the valence shells, 3s and 3p are filled. Hence all together, the filled orbitals are; 1s,2s,2p,3s,3p.