Beginning with Larson's atomic structure model,
The Deuterium atom: 2-1-(1)
An object one unit short of the more stable state of the inert gas, helium, 2-1-0. Deuterium is somewhat unstable just in its own right, as hydrogen much prefers the mass one state in nature. Deuterium is relatively rare.
The Lithium atom: 2-1-1