Electronic Configurations of First 20 Elements
The electronic configuration of the first twenty elements of the periodic table is shown in the table added below,
Element |
Symbol |
Atomic Number |
Electronic Configuration |
---|---|---|---|
H |
1 |
1s1 |
|
He |
2 |
1s2 |
|
Lithium |
Li |
3 |
[He] 2s1 |
Beryllium |
Be |
4 |
[He] 2s2 |
Boron |
B |
5 |
[He] 2s2 2p1 |
C |
6 |
[He] 2s2 2p2 |
|
N |
7 |
[He] 2s2 2p3 |
|
O |
8 |
[He] 2s2 2p4 |
|
Fluorine |
F |
9 |
[He] 2s2 2p5 |
Neon |
Ne |
10 |
[He] 2s2 2p6 |
Sodium |
Na |
11 |
[Ne] 3s1 |
Magnesium |
Mg |
12 |
[Ne] 3s2 |
Aluminum |
Al |
13 |
[Ne] 3s2 3p1 |
Silicon |
Si |
14 |
[Ne] 3s2 3p2 |
P |
15 |
[Ne] 3s2 3p3 |
|
Sulfur |
S |
16 |
[Ne] 3s2 3p4 |
Cl |
17 |
[Ne] 3s2 3p5 |
|
Ar |
18 |
[Ne] 3s2 3p6 |
|
Potassium |
K |
19 |
[Ar] 4s1 |
Calcium |
Ca |
20 |
[Ar] 4s2 |
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Electronic Configuration in Periods and Groups
Electronic Configuration is the arrangement of electrons in orbitals around an atomic nucleus. Electronic Configuration of a molecule refers to the distribution of electrons in various molecular orbitals. The number of electrons in bonding and antibonding molecular orbitals of a molecule or molecular ion can be calculated from its electronic configuration.
In this article, we will learn about Electronic Configuration, Electronic Configuration in Periods, and Electronic Configuration in Groups.
Table of Content
- What is Electronic Configuration?
- Electronic Configuration in Periods
- Electronic Configuration in Groups
- Electronic Configurations of First 20 Elements