What happens to the number pf protons in an atom as you move across a period.


The number of protons increase
The number of protons stay the same The number of protons decrease​

Respuesta :

Answer:

A. The number of protons increase.

Explanation:

Each element rank is determined by the number of protons.

Hydrogen is #1 with 1 proton, Helium is #2 with 2 protons, Lithium is #3 with 3 protons, and so on.