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