Which of the following statements apply to a proton?
Choose one or more:
A. It has a mass of approximately 1 u.
B. It is a nucleon.
C. It is assigned a 1+ charge.
D. It is assigned a 1- charge.
E. The number present corresponds to the identity of an element.
F. Its number can vary in different isotopes of the same neutral element.
G. It is found in orbitals outside of the nucleus.