The state of an atom where all the electrons in the atom are in their lowest energy levels is called the ground state.

The state of an atom where all the electrons in the atom are in their lowest energy levels is called the ground state.
Elements | Protons | Electrons | Neutrons | Atomic Number | Mass Number |
A | – | – | 10 | 8 | – |
B | 15 | – | – | – | 31 |
C | 1 | – | – | – | 3 |
D | – | 11 | 12 | – | – |
X | Y | |
Protons | 8 | 8 |
Neutrons | 8 | 10 |