the number of protons in the nucleus of an atom

the number of protons and neutrons in the atom

the total number of protons and neutrons in a nucleus.

a particle smaller than an atom

an atomic orbital

THE FIXED AMOUNT OF ENERGY A MOLECULE, ATOM, ELECTRON, OR NUCLEUS, CAN HAVE.

an outer shell electron that is associated with an atom

tendency of a material to resist change or decomposition

tendency of a substance to undergo chemical changes in a system.

conducts or transmits heat, electricity, or sound

substance or device that does not readily conduct electricity.

can conduct electricity under some conditions but not others