The atomic number of an element is determined by:
(A) The number of electrons in an atom
(B) The number of neutrons in one atom
(C) The valency of the element
(D) The number of protons in one atom
The atomic number of an element is determined by:
(A) The number of electrons in an atom
(B) The number of neutrons in one atom
(C) The valency of the element
(D) The number of protons in one atom