Definitions for "Atomic nucleus"
The nucleus (atomic nucleus) is the centre of the atom. It's made up of particles called protons and neutrons, and surrounded by particles called electrons.
Concentrated, positively charged matter at the center of an atom; composed of protons and neutrons.
A tiny structure at the center of an atom, containing almost all the mass of the atom. Consists of protons and neutrons.
a COMPOUND particle of different structure than atomic singularities
Keywords:  thing, small
a very small thing