C. The number of protons
An atom's identity is determined by the number of protons in its nucleus, which is known as the atomic number. Each element on the periodic table has a unique number of protons.
A. The valence number
B. The number of electrons.
C. The number of protons
D. The number of neutrons.
1 answer
C. The number of protons
An atom's identity is determined by the number of protons in its nucleus, which is known as the atomic number. Each element on the periodic table has a unique number of protons.