The coordination geometry around the manganese in decacarbonyldimanganese(0) is:

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Strategy:
 Identify the coordination number around a single Manganese atom in .

Step 1: Structure of 
Decacarbonyldimanganese(0) consists of two manganese atoms joined by a  metal-metal bond.
There are identical  units on each side.
Around a single Manganese atom, there are 5 terminal  ligands and 1  atom.

Step 2: Determine geometry
The coordination number is .
Six electron domains around a central point arrange themselves into an octahedral geometry. (The  bond occupies one axial position of

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