The answer is B. the molar mass.
The molar mass of a chemical compound is defined as the mass of a sample of that compound divided by the amount of substance in that sample, measured in moles.
answer : Neutron, neutral subatomic particle that is a constituent of every atomic nucleus except ordinary hydrogen.
A, milligrams because rice is very small therefore you'd need to use a very small unit of measurement.
6 protons
4 electrons in 1st shell
2 valence electrons 2nd shell
