# What two particles account for almost all of the mass of an atom?

$\text{Protons and neutrons...}$
The atom is composed of massive particles of formal positive, and neutral electronic charge, around which electrons, negatively-charged particles of negligible mass, whizz about. At nuclear ranges, which are MINUTE, the massive particles engage in the $\text{strong nuclear force}$, an attractive force which holds the nucleus together. The electronic charge signs of the electrons and the charged-nuclear particles are entirely arbitrary....the point is that that they oppositely charged...
Note that sometimes we refer to a ""^1H^+ particle as a $\text{proton}$. This is a bit of a misnomer even tho' it is technically true… because such protons are present in the nuclei of ALL elements. The number of protons determines ${Z}_{\text{the atomic number..}}$. How does the number of electrons relate to $Z$?