Question

An atom has 15 electrons. How many are on each shell? *

0 2,8,7
0 2,8,5
8,7
15

Answer 1

So... for the element of PHOSPHORUS, you already know that the atomic number tells you the number of electrons. That means there are 15 electrons in a Phosphorus atom. Looking at the picture, you can see there are two electrons in shell one, eight in shell two, and five in shell three.