Which subatomic particles are found in the nucleus of an atom of beryllium?
a. neutrons and protons
b. electrons and positrons
c. electrons and protons
d. neutrons and electrons

explain why the answer is correct in detail.

A. the nucleus carries a positive charge, and the electron cloud carries a negatuve charge. since neutrons carry no charge, the nucleus composed of neutrons and protons carry a positive charge.

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.