In what order do electrons fill orbitals within the 3p sublevel? electrons don’t fill orbitals; protons and neutrons fill orbitals. they double up first, then move on to the next orbital when the first is full. they spread out, waiting until each orbital has one electron before doubling up. they fill the orbitals in random order; you cannot predict exactly where they’ll be

 The order  do electron fill  orbitals within the 3p sublevel  is that they spread  out, waiting  until each orbital  has one electron before  doubling  up.

Explanation

According    to   hund's  rule  every orbital in a   subshell  is singly  occupied  with  one  electron before  any one orbital  is  doubly  occupied,and  all electrons  in   singly occupied  orbital have the same spin.

when every orbital  in a subshell is   singly  occupied by electrons it is then  doubled, and the two electrons  in same orbital  have  opposite spins

the answer is a! (2.9 x 10^-18 j) hope i could someone. : )