Electronic configurations
Use of electronic configuration- electronic configuration can be used to find valency, charge, and so on.
Sub atomic particles present in an atom-
Sub atomic
Particles
|
Charge
|
Mass of particle
|
Electron
|
Negative
‘-’
|
|
Proton
|
Positive ‘+’
|
|
Neutron
|
No charge
|
How to doelectronic configuration-
Step 1- find the atomic number of electron
in an element.
Step 2- find the the no. Of electron in
the orbit of an atom.
Formula for finding the number of
electrons in orbit is -
n means serial number of orbit like –
1,2,3.....etc.
Step 3- divide electrons according to no.
Of electron in orbit is -
Some facts about electronic configuration-
Ø Orbits are denoted in electronic configuration by K,L,M...etc. or
1,2,3....etc.
Ø It helps to find valency of an element.
Ø It helps to find charge of an element.
Ø It helps to make chemical formulas.
Electronic configuration from 1 to 20
elements-
Atomic number
|
elements
|
Electronic cofigration
|
||||||
----
|
------
|
K
|
L
|
M
|
N
|
O
|
P
|
|
1
|
Hydrogen
|
1
|
||||||
2
|
Helium
|
2
|
||||||
3
|
Lithium
|
2
|
1
|
|||||
4
|
Beryllium
|
2
|
2
|
|||||
5
|
Boron
|
2
|
3
|
|||||
6
|
Carbon
|
2
|
4
|
|||||
7
|
Nitrogen
|
2
|
5
|
|||||
8
|
Oxygen
|
2
|
6
|
|||||
9
|
Fluorine
|
2
|
7
|
|||||
10
|
Neon
|
2
|
8
|
|||||
11
|
Sodium
|
2
|
8
|
1
|
||||
12
|
Magnesium
|
2
|
8
|
2
|
||||
13
|
Aluminum
|
2
|
8
|
3
|
||||
14
|
Silicon
|
2
|
8
|
4
|
||||
15
|
Phosphorus
|
2
|
8
|
5
|
||||
16
|
Sulfur
|
2
|
8
|
6
|
||||
17
|
Chlorine
|
2
|
8
|
7
|
||||
18
|
Argon
|
2
|
8
|
8
|
||||
19
|
Potassium
|
2
|
8
|
8
|
1
|
|||
20
|
Calcium
|
2
|
8
|
8
|
2
|
|||
OR
NUMBER
|
ELEMENT
|
ELECTRON CONFIGURATION
|
1
|
Hydrogen
|
1s1
|
2
|
Helium
|
1s2
|
3
|
Lithium
|
[He]2s1
|
4
|
Beryllium
|
[He]2s2
|
5
|
Boron
|
[He]2s22p1
|
6
|
Carbon
|
[He]2s22p2
|
7
|
Nitrogen
|
[He]2s22p3
|
8
|
Oxygen
|
[He]2s22p4
|
9
|
Fluorine
|
[He]2s22p5
|
10
|
Neon
|
[He]2s22p6
|
11
|
Sodium
|
[Ne]3s1
|
12
|
Magnesium
|
[Ne]3s2
|
13
|
Aluminum
|
[Ne]3s23p1
|
14
|
Silicon
|
[Ne]3s23p2
|
15
|
Phosphorus
|
[Ne]3s23p3
|
16
|
Sulfur
|
[Ne]3s23p4
|
17
|
Chlorine
|
[Ne]3s23p5
|
18
|
Argon
|
[Ne]3s23p6
|
19
|
Potassium
|
[Ar]4s1
|
20
|
Calcium
|
[Ar]4s2
|
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