11
Na
Sodium
Sodium
Sodium (Na)
Alkali Metals · Solid · Period 3 · Group 1
Element Properties
- Atomic Number
- 11
- Symbol
- Na
- Atomic Mass
- 22.9898
- Category
- Alkali Metals
- Standard State
- Solid
- Period
- 3
- Group
- 1
- Electronegativity
- 0.93
- Atomic Radius
- 227
- Ionization Energy
- 5.14
- Electron Affinity
- 0.55
- Oxidation States
- +1
- Melting Point
- 370.95 K (97.8 °C)
- Boiling Point
- 1156 K (882.85 °C)
- Density
- 0.97
- Electron Configuration
- [Ne]3s1
- Year Discovered
- 1807
Electron shells
[Ne]3s1
Electrons are arranged in shells (principal energy levels) around the nucleus. The diagram is a schematic — orbitals in the same shell are not drawn separately.
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Frequently asked questions
What is the atomic number of Sodium?
The atomic number of Sodium is 11, which equals the number of protons in its nucleus.
What is the atomic mass of Sodium?
The atomic mass of Sodium is approximately 22.9898 u (one twelfth of the mass of a carbon-12 atom).
What is the electron configuration of Sodium?
The electron configuration of Sodium is [Ne]3s1.
Where is Sodium in the periodic table?
Sodium is located in period 3, group 1.
When was Sodium discovered?
Sodium was discovered in 1807.
Related elements
Same group
1
H
Hydrogen
1.008
3
Li
Lithium
7
19
K
Potassium
39.098
37
Rb
Rubidium
85.468
55
Cs
Cesium
132.905
87
Fr
Francium
223.02