Answer;
B. 1 amu
Explanation;
-An atom of an element is made up of three subatomic particles, namely; protons, neutrons and electrons. Electrons are positively charged and found in the energy levels of an atom. Both protons and the neutrons are found in the nucleus of an atom, protons are positively charged and neutrons have no charge.
-The nucleus of atom carries the most mass of an atom with the energy levels carrying negligible mass of an atom. The mass of neutron is approximately 1.0 amu, that of a proton is also approximately 1.0 amu, and that of an electron is about 1/2,000 amu.
