What is the minimum amount of energy
that can be gained or lost by an atom?

quantum (93) the minimum quantity of energy that can be lost or gained by an atom (plural: quanta)

Explanation:

A quantum is the minimum amount of any physical entity involved in an interaction.

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be