What is true of protons? they are positively charged and located inside the nucleus. they are positively charged and located outside the nucleus. they are negatively charged and located inside the nucleus. they are negatively charged and located outside the nucleus.

They are positively charged and located inside the nucleus.

Explanation:

An atom is smallest unit of a matter or substance.It consist of three subatomic particles : electrons, protons, neutrons.

Protons are positively charged and neutrons are neutral and both are located in the center of an atom where most of mass of an atom is concentrated and is called as nucleus.

Atomic mass = Number of protons + Number of neutrons

Electrons are negatively charged and are located outside the nucleus where they orbit in different energy levels around the nucleus.

Hence protons are positively charged and located inside the nucleus.

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