Question: how many electrons in the outer shell of nickel?
Answer: Outside the nucleus, four energy levels are needed to hold the 28 negatively charged electrons. The electron configuration of Nickel is Na 2, 8, 16, 2 where 2 electrons are present in the shell closest to the nucleus, 8 in the second closest, 16 in third and 2 in the outer shell, better known as the valence shell.