# Arrangements or Distribution of electron

## The arrangement or Distribution of electron in the atom

• The distribution or arrangements of electron in different shell of the atom is called electronic configuration Of the elements.
• The arrangements of electron in different shell should be such that it should have Maximum stability. Thus to write electronic configuration of an element, we should know
• Total number of electron presents in the atom . This is equal to the number of protons ( that is atomic number)  for  a neutral atom.
• Maximum number of electron that can present in each shell of atom .  This is given by Bohr-Bury scheme. 2n2    n= designation.  K shell (n=1) , L shell (n=2) , M shell (n=3) , N shell (n=4) ,

 Shell N 2n2 Maximum number of electron K 1 2(1) 2 2 L 2 2(2) 2 8 M 3 2(3) 2 18 N 4 2(4) 2 32

Formula:

The maximum number of electron in any one shell= 2n2

Here n = shell number

K shell:

Maximum number of electron 2(1) 2

= 2×1

= 2 Maximum   2 electron present in K shell

• L shell:

Maximum number of electron 2(2) 2

= 2×4

= 8 Maximum 8 electron present in L Shell

• M shell:

Maximum number of electron 2(3) 2

= 2×9

= 18 Maximum 18 electron present in M shell

• N shell:

Maximum number of electron 2(4) 2

= 2×16

=32

Maximum 32 electron present in N shell

• The third M shell can be hold 8, or 18 electrons but the total capacity of third shell is 18.
• The outer most of the orbit or shell of elements electron called valence electrons. Or valence shell.
• For example : Ca   (calcium )

Electronic configuration of Ca = 2, 8, 8, 2

K shell= 2 electron

L shell= 8 electron

M shell=8 electron

N shell= 2 electron • For example : C  (Carbon )

Electronic configuration of C = 2, 4

K shell= 2 electron

L shell= 4 electron For example :    N (Nitrogen )

Electronic configuration of N = 2, 5

K shell= 2 electron

L shell= 5 electron ### Question Answer

1) What is electronic configuration?

Answer: The distribution or arrangements of electron in different shell of the atom is called electronic configuration Of the elements.

2) What are the rule given by Bohr- Bury Scheme?

Answer: • The arrangements of electron in different shell should be such that it should have Maximum stability. Thus to write electronic configuration of an element, we should know  following.

• Total number of electron presents in the atom . This is equal to the number of protons ( that is atomic number)  for  a neutral atom.
• Maximum number of electron that can present in each shell of atom . This is given by Bohr-Bury scheme .

3) How are the divination of shell by 2n2    formula?

Answer: 2n2    n= designation.  K shell (n=1) , L shell (n=2) , M shell (n=3) , N shell (n=4) , K shell:  2(1) 2 = 2

L shell:  2(2) 2 = 2×4= 8

M shell:  2(3) 2 = 2×9= 18

N shell:   2(4) 2 = 2×16=32

4) Give the example of Ca electron distribution?

• Answer: Ca   (calcium )
• Electronic configuration of Ca = 2, 8, 8, 2

K shell= 2 electron

L shell= 8 electron

M shell=8 electron

N shell= 2 electron

5) Give the example of Nitrogen ,How electron will be arrange in shell?

Answer: example : N  (Nitrogen) Electronic configuration of N = 2, 5

K shell= 2 electron

L shell= 5 electron

Updated: April 21, 2021 — 2:27 am