Question

An atom's first 2 energy levels are filled and there are 2 electrons in the third energy

level. It's atomic number is:

Answer 1

Atomic number is 12.

Step-by-step explanation:

Atomic number = electrons in filled shells + outermost electrons

= 2 + 8 +2

= 12

Answer 2

12

Step-by-step explanation:

2+8+2=12

atomic no is the No of protons