The "Atomic Number" of an Element That Appears in the Periodic

The "atomic number" of an element that appears in the periodic table of the elements represents

A) the number of protons in the nucleus of an atom of that element.
B) the number of electrons in the nucleus of an atom of that element.
C) the number of atoms in a molecule of the element.
D) the number of neutrons in the nucleus of an atom of that element.
E) the number of nuclei in an atom of the element.