The atomic number of an atom is determined by the
A) number of protons.
B) number of neutrons.
C) number and arrangement of electrons.
D) size of the atom.
E) mass of the atom.

Question

Quizplus · Accepted Answer

The atomic number of an atom is equal to the number of protons in its nucleus. This is because each element on the periodic table has a unique number of protons, which determines its identity.

The Atomic Number of an Atom Is Determined by the