Question

What do we call the tiny core at the center of an atom, containing most of the atom's mass and all of its positive charge?

Answer 1

The tiny core of the center of an atom, containing most of the atoms mass and all of its positive charge is the nucleus.

Answer 2

It is called the "nucleus". most of its weight is concentrated at nucleus. It is held by the "strong nuclear force",because of the repulsive nature of both like charges of protons.