Respuesta :
the atomic number of cobalt is 27
when writing the electronic configuration of cobalt, electrons are arranged into energy shells and subenergy shells .
the complete electron configuration for cobalt is as follows
Co - 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁷ 4s²
we can write this in the condensed form
writing in condensed form is when you write the noble gas symbol for the noble gas with the closest atomic number
Ar is the closest noble gas with atomic number of 18
electron configuration for Ar is as follows
Ar - 1s² 2s² 2p⁶ 3s² 3p⁶
so we can substitute Ar in the electron configuration upto the 18th electron
so the condensed electron configuration for Co is as follows
[Ar] 3d⁷ 4s²
