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C is the best answer for that.  The outer shell has a full octet

The element C exist as single atom.

What is atom?

The base unit of standard matter that makes up a chemical element is just an atom. Atoms that are neutral or ionized make up every solid, liquid, gas, as well as plasma.

What is element?

Any compound that could be broken into simpler components by standard chemical processes is referred to be a chemical element.

It can be seen that element C has completed its octet. Hence, it will exist as single atom.

To know more about element and atom .

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