What is an atomic nucleus?

a.)the outer part of an atom in which electrons move
b.)the outer part of an atom in which neutrons move
c.)the central part of an atom, composed of protons and neutrons
d.)the central part of an atom, composed of protons and electrons

The correct option is (C).

Explanation:

An atom is a smallest unit of the matter. Atom consists of electrons, protons, nucleus and neutrons.

Nucleus is the central part of the atom where the whole mass of the atom is supposed to be concentrated.

The electrons revolve around the nucleus. They are negatively charged particle.

The protons are located in the nucleus. They are positively charged particle.

The neutrons are located in the nucleus. They are neutral charged particle.

Therefore, an atom nucleus is the central part of an atom, composed of protons and neutrons.

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a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.