Question

multiple choice 10 points
1
which distinguishes an atom of one element from an atom of a different element?
2
○ the number of valence electrons
3
○ the number of protons in the atomic number
4
○ the number of neutrons in the atomic mass number

Explanation:

The atomic number, defined by the number of protons, uniquely identifies an element. Different elements have distinct proton counts.

Answer:

1. The number of protons in the atomic number