How is the atomic number used to determine the identity of an atom

"The number of protons in one atom of an element determines the atom's identity, and the number of electrons determines its electrical charge. The atomic number tells you the number of protons in one atom of an element. It also tells you the number of electrons in a neutral atom of that element."

Explanation:

-irion-isd.org:)

Hope  this helps:) Can I Pleasse have brainliest?!

the answer is option a.