Lewis dot structure for transition metals?

Cobalt has atomic number 27 and is found in the 4rd row of the periodic table, to the left of copper and nickel. Can you find it now?

Or did you mean the structure itself?

Being in the 4th row means that it has 4 shells. Remember that the maximum number of electrons that the shells can hold are:

1st shell: 2
2nd shell: 8
3rd shell: 18
4th shell: 32

There are 2 electrons in the first shell, 8 electrons in the second shell and since Co is found in the 8th column of the transition block, it has 8+8 = 16 electrons (the first 8 is from the p subshell and the next 8 is from the d subshell, which is obtained from the column number) in the 3rd shell and the 4th shell contains 2 electrons.