How many unpaired electron present in Cu +iona) 1 b) 6 c) 0 d) 10

To determine the number of unpaired electrons in the Cu+ ion, we need to consider the electron configuration of copper.

The atomic number of copper is 29, which means it has 29 electrons.

To find the electron configuration of copper, we can refer to the periodic table. Copper is in the 3d block, so its electron configuration is [Ar] 3d^10 4s^1.

When copper loses one electron to form the Cu+ ion, the electron configuration becomes [Ar] 3d^10.

In the 3d orbital, there are a total of 10 electrons. Since all the electrons are paired up, there are no unpaired electrons in the Cu+ ion.

Therefore, the correct answer is c) 0.