Question

The atomic number of F plus the atomic number of Na equals the atomic number of this element

Answer 1

Explanation:

Atomic number means the sum of total number of protons present in an element.

Atomic number of fluorine is 9 whereas atomic number of sodium is 11.

Therefore, atomic number of F + atomic number of Na

                 = 9 + 11

                 = 20

It is known that calcium is the element that has atomic number 20. Its electronic distribution is 2, 8, 8, 2.

Thus, we can conclude that the atomic number of F plus the atomic number of Na equals the atomic number of element calcium.

Answer 2

Atomic number of F = 9.
Atomic number of Na = 11. 

Atomic number of F + Atomic number of Na = 9+11 = 20
Atomic number of Ca = 20

Therefore the atomic number of F plus the atomic number of Na equals the atomic number of Ca. 

Hope this helps you, have a great day ahead!