The structure is determined according to the following equations:
Closo - 14n + 2 valence e-
Nido - 14n + 4 valence e-
Arachno - 14n + 6 valence e-
Hypho - 14n + 8 valence e-
(where n = number of vertices or metal atoms in the cluster.)
For example, [Rh6(CO)16]
14n = 14 x 6 = 84
Rh belongs to group IX. Hence the valence electrons in it is 9 (both d and subshell's electrons)
Total valence electron count (TVE) = 6(9) + 16(2) = 86.
There are 4n+2 = 84 + 2 valence electrons and hence a ‘closo cluster'
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