Explanation:
Number of protons means atomic number of an atom. Element whose atomic number is 27 is cobalt.
When an atom is neutral then the number of protons equal the number of electrons.
Cobalt is a transition element or it is also known as d-block element. The electronic configuration of cobalt is as follows.
[tex]1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{7}[/tex]
