Question

Which statement describes an atomic nucleus?

An atomic nucleus is negatively charged.
An atomic nucleus has no electrical charge.
An atomic nucleus consists of mostly empty space.
An atomic nucleus contains most of the atom’s mass.

Answer 1

An atomic nucleus contains most of the atom’s mass.

Explanation: The nucleus holds the protons and neutrons (which account for nearly all the atom’s mass) and is positively charged; the atom as a whole is mostly empty space occupied by orbiting electrons.