Question

The table below lists three characteristics of an atom of an element

Number of protons:10
Number of neutrons:10
Number of Valence Electrons:8

An atom of which element is described by the data in the table?

Answer 1

It’s Neon (Ne)

Explanation
Neon has 10 protons, and 10 neutrons.
How to find neutrons:
The number of mass minus the number of protons. 20-10=10.

Valence electrons are the number on the last shell of energy level, with is 8.
But a easy way to find it is by looking at the group number, the last group number in case 18 only focus at 8. Questions?