Question

describe the nucleus of an atom

Answer 1

CENTER OF AN ATOM
The nucleus, that dense central core of the atom, contains both protons and neutrons. Electrons are outside the nucleus in energy levels. Protons have a positive charge, neutrons have no charge, and electrons have a negative charge.

A neutral atom contains equal numbers of protons and electrons. But the number of neutrons within an atom of a particular element can vary. Atoms of the same element that have differing numbers of neutrons are called isotopes.

Answer 2

  The nucleus is composed of positively charged protons and neutrally charged neutrons. It is very dense compared to the electron cloud, and nearly all of the mass on an atom is in its nucleus.