ELECTRONIC CONFIGURATION

 Electronic configuration is the arrangement of electron on the shell around the nucleus. 

Niel Bohr 1913 posits that the electrons in an atom revolve around the nucleus.

Niels Bohr (1913) suggested that electrons revolve round then ucleus on shells or orbits that contains the proton and the neutron

 The shells are designated with alphabets from the innermost as K,L,M,N,O, etc

 The shells are associated with defined energy content with K shell having the lowest energy content

 The shells can also be represented with energy level (n)

where K,L,M,N,O are designated as n=1,2,3,4,5

 Using the formula 2n², where n is the shell number; the maximum number of electron a shell will contain can be calculated.

 K- Shell with n is 1 will contain a maximum of two electrons.i .e. 2x1² =2, when n is 2, M-shell become 2x2²= 8 etc