▁entire ▁mole c ule ▁as ▁if ▁it ▁were ▁an ▁atom ' s ▁nucle us . ▁ ▁VS i 1 6 F ▁= ▁has ▁ion ic ▁bond ing . ▁ ▁A ▁cluster ▁of ▁ 1 3 ▁plat in um ▁becomes ▁highly ▁param agnet ic , ▁much ▁more ▁so ▁than ▁plat in um ▁itself . ▁ ▁A ▁cluster ▁of ▁ 2 0 0 0 ▁rub id ium ▁atoms . ▁ ▁Super atom ▁complex es ▁Super atom ▁complex es ▁are ▁a ▁special ▁group ▁of ▁super at oms ▁that ▁incorpor ate ▁a ▁metal ▁core ▁which ▁is ▁stabil ized ▁by ▁organ ic ▁lig ands . ▁ ▁In ▁th i olate - protected ▁gold ▁cluster ▁complex es ▁a ▁simple ▁electron ▁counting ▁rule ▁can ▁be ▁used ▁to ▁determine ▁the ▁total ▁number ▁of ▁electrons ▁() ▁which ▁correspond ▁to ▁a ▁magic ▁number ▁via , ▁ ▁where ▁ ▁is ▁the ▁number ▁of ▁metal ▁atoms ▁( A ) ▁in ▁the ▁core , ▁ ▁is ▁the ▁atomic ▁val ence , ▁ ▁is ▁the ▁number ▁of ▁electron ▁withdraw ing ▁lig ands , ▁and ▁ ▁is ▁the ▁overall ▁charge ▁on ▁the ▁complex . ▁For ▁example ▁the ▁Au 1 0 2 ( p - M BA ) 4 4 ▁has ▁ 5 8 ▁electrons ▁and ▁corresponds ▁to ▁a ▁closed ▁shell ▁magic ▁number . ▁ ▁Gold ▁super atom ▁complex es ▁ ▁Au 2 5 ( S Me ) 1 8 − ▁▁ ▁Au 1 0 2 ( p - M BA ) 4 4 ▁▁ ▁Au 1 4 4 ( SR ) 6 0 ▁ ▁Other ▁super atom ▁complex