Question

what is meant by an atom being in the ground state?

Explanation:

Define the ground state

The ground state represents the lowest possible energy state of an atom.

Describe electron configuration

In this state, electrons occupy the lowest available Atomic Orbitals.

Contrast with excited states

Any state with higher energy than the ground state is an excited state.

Answer:

An atom is in the "ground state" when all of its electrons occupy the lowest possible energy levels and orbitals available, representing the most stable, lowest-energy configuration of the atom.