All of the Following Statements Are True EXCEPT

Multiple Choice

All of the following statements are true EXCEPT

A) all atoms of a given element have the same mass number.
B) for any neutral element,the number of electrons is equal to the number of protons.
C) the mass number is the sum of the number of protons and neutrons.
D) isotopes of atoms contain the same number of protons but a different number of neutrons.
E) the atomic number equals the number of protons in an atom.