Material

Atomic Populations (Mulliken)

Bond

Population

Formation Enthalpy (eV)

Electronegativity

S

P

Graphene

1.05

2.95

3.05

−3.10E+02

2.55

Silicene

1.4

2.6

2.75

−2.14E+02

1.9

Germanene

1.57

2.43

2.03

−2.14E+02

2.01

Stenane

1.65

2.35

1.99

−1.90E+02

1.96