Question

Element X and Y have the following electronic configurations (X and Y are not the correct symbols of the elements.)
х
Y
2,8,2
2.8.8.2
What is the atomic number of Element Y?

Answer 1

Answer:

20

Explanation:

The atomic number tells you the amount of electrons and protons in an atom so if you add all of the electrons up (2+8+8+2) you get 20.