The atomic number of an element is equal to which of the following ? 1 point 1) the number of neutrons in the nucleus 2) the number of protons in nucleus 3) the number of electrons in the nucleus 4) the number of electrons outside of the nucleus in any species

The atomic number of an element is equal to which of the following ?

1.	The atomic number of an element is equal to which of the following ? 1 point 1) the number of neutrons in the nucleus 2) the number of protons in nucleus 3) the number of electrons in the nucleus 4) the number of electrons outside of the nucleus in any species
Answer» the NUMBER of NEUTRON in the NUCLEUS