The only given substance in which the atoms are held together by metallic bonding is;
Option 5: Cr
The missing options are;
1) CO₂
2) Si
3) Br₂
4) S₈
5) Cr
Now, metallic bonding is a type of chemical bonding that is created as a result of the electrostatic attractive force between conduction electrons and positively charged metal ions.
This suggests that metallic bonding holds atoms together in metallic substances.
Now, among all the options given, the only one that is a metallic substance is Cr which is Chromium.
In conclusion, the metallic substance chromium is the only one among the options that will have it's atoms held together by metallic bonding.
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