How many d electrons are found in cobalt?

7

Explanation:

Seven d electrons are found in cobalt.Here is the way to find the number of d electrons  in cobalt.

The electrons that are found in d subshell or orbitals are called d electrons.

The atomic number of cobalt is 27.This means that cobalt has 27 protons and 27 electrons.

Now write the electron configuration of cobalt:

₂₇Co =1s²2s²2p⁶3s²3p⁶4s²3d⁷

In 3d⁷ subshell,we are getting 7 electrons.So,in cobalt you get seven d electrons.