Nature of Chemical Bonding and Metalloaromaticity of Na<sub>2</sub>[(MArx′)<sub>3</sub>] (M = B, Al, Ga; Arx′ = C<sub>6</sub>H<sub>3</sub>-2,6-(C<sub>6</sub>H<sub>5</sub>)<sub>2</sub>)

The nature of chemical bonding and metalloaromaticity of Na<sub>2</sub>[(MArx′)<sub>3</sub>] (M = B, Al, Ga) have been studied within the framework of the atoms in molecules (AIM) theory and using electron localization function (ELF) analysis. The π electrons of the studied systems were separated from the total electron density and analyzed. The calculated results indicate that there are closed-shell weak interactions between the sodium atom and the M<sub>3</sub> (M = B, Al, Ga) ring, between the sodium atom and the terminal phenyl group on each Arx′, and between the terminal phenyl groups on Arx′ in Na<sub>2</sub>[(MArx′)<sub>3</sub>]. The Na<sub>2</sub>[(MArx′)<sub>3</sub>] has metalloaromatic nature, and the sodium atoms have an active role in determining the computed aromatic properties of the three-numbered cycle.