Which of the following make up the nucleus of an atom? a. protons and neutrons b. electrons only c. neutrons only d. protons and electrons

A. protons and neutrons

Explanation: An atom is smallest unit of a matter or a substance.Every atom consists of three subatomic particles : electrons, protons, neutrons.

Protons and Neutrons are located in the center of an atom where while mass of an atom is concentrated.

Atomic mass = Number of protons + Number of neutrons

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

b is the correct answer

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c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.