How many unpaired electrons are in the c 2 + ion?

Atomic number of C is 6. Hence, there are 6 electrons in carbon.

The electronic configuration of carbon is 1s2, 2s2, 2p2

Here, there are 2 unpaired electron. However, C2 + ions have 2 electrons less as compared to C.

Hence, electronic configuration of C 2 + ion is 1s2, 2s2. All the electrons are paired in this system. So there are no unpaired electrons in C 2 + ion.