Many elements have non-intergral atomic masses because
(1)the constituents neutrons, protons, and electrons, commbine to give fractional masses
(2) they have isotopes
(3) their isotopes have nonintergal masses
(4) their isotopes have different masses

Options

A. Their isotopes have different atomic number
B. Their isotopes have different masses
C. Their isotopes have non-integral masses
D. Their constituents, protons, electron and neutrons combine to give fractional masses

Answer

B

Explanation

Atomic masses are average values of mass of isotopes