Electronic configurations

                   Electronic configurations

 Electronic configuration- electronic configuration the process of dividing electrons equally into orbits of an element.

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 ‘-’	9.109390 x10-31 kg
Proton	Positive ‘+’	1.672623 x 10-27 kg
Neutron	No charge	1.672623 x 10-27 kg

  

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