Question

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​

Answer 1

A. The number of protons increase.

Step-by-step 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.