Im taking the test now! Valence electrons determine the reactivity of an element. Where would the valence electrons be located in a neutral atom?
a) throughout the electron cloud
b) Nucleus
c)Intermost shell of the electron cloud
d) outermost shell of the electron cloud

D) outermost shell of the electron cloud

Because electrons have negligible mass, to account for the mass of the isotope, there must be 16 neutrons, 16 neutrally charged, massive, fundamental particles present in the sulfur nucleus. and thus finally, if we have the 32s2− ion, there are 18 electrons, 16 protons, and 16 neutrons.