Question

multiple choice question
a quantum is
the minimum amount of energy that can be gained or lost by an atom.
the amount of energy required to remove an electron from an atom.
the minimum amount of energy that can be absorbed by an atom that causes it to emit ultraviolet li
the amount of energy associated with all photons.

Explanation:

According to the concept of quantum in physics, a quantum is the minimum amount of any physical entity involved in an interaction. In the context of atomic energy, it is the minimum amount of energy that can be gained or lost by an atom.
The amount of energy required to remove an electron from an atom is called ionization energy.
The description about causing an atom to emit ultraviolet light is too specific and not the general definition of quantum.
The amount of energy associated with all photons is not the definition of quantum.

Answer:

the minimum amount of energy that can be gained or lost by an atom.