Which statement about an atom is true ? A. all the elements have only one nucleon (mass) number.
B. the nucleon (mass )number can be less than the proton (atomic) number.
C. the nucleon (mass) number can equal the proton (atomic) number.
D. the number of neutrons never equals the number of electrons with answer

plasma is the state of matter where the substance is ionized and has no definite shape or volume. the fact of being ionized makes the substance a good electrical conductor.

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.