vertex count of solid compounds

solid compounds | vertex count

1 | aluminum, beryllium, cobalt, copper, iron, lithium, scandium, vanadium, zinc 2 | beryllium oxide, lime, lithium fluoride, magnesium oxide, potassium fluoride, sodium fluoride, vanadium(II) oxide 3 | quartz 4 | sodium amide 9 | acetamide 12 | acetoxime