1. ELECTRONIC CONFIGURATION.
a) What is electronic configuration?
b) Draw the diagram to show the different shells and how to calculate the no of electrons they     
    fit in each shell. 

Dear student
For (a)
https://www.meritnation.com/ask-answer/question/what-do-you-mean-by-electronic-configuration/structure-of-the-ato.../3890472

b)The following diagram shows the different shells in case of Mg. which has the configuration 2,8,2


Maximum number of electrons that a shell (K, L, M and N.... ) can hold is given by is given by 2n2  rule where n is the number of shell. 
For K shell, n= 1  2×1= 2, means K shell can accommodate 2 electrons
For L shell, n = 2,  2× 2= 8, means L shell can accommodate 8 electrons.
For M shell, n = 3, 2×3= 18, means M shell can accommodate 18 electrons.
For N shell, n = 4, 2×42 = 32, means N shell can accommodate 32 electrons.

 

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