A student needs to find the mass of an atom. The numbers of which atomic particles determines the mass of the atom?
A B C D
only its protons only its electrons both its protons and neutrons both its neutrons and electrons
Question: A student needs to find the mass of an atom. The numbers of which atomic particles determines the mass of the atom?
(A) only its protons
(B) only its electrons
(C) both its protons and neutrons
(D) both its neutrons and electrons

Answer: (C) both its protons and neutrons
Answer: (B) only its electrons
Question: A student needs to find the mass of an atom. The numbers of which atomic particles determines the mass of the atom?
(A) only its protons
(B) only its electrons
(C) both its protons and neutrons
(D) both its neutrons and electrons
Answer: (C) both its protons and neutrons