1
H
Hydrogen
Hydrogen
Hydrogen (H)
Reactive Nonmetals · Gas · Period 1 · Group 1
Element Properties
- Atomic Number
- 1
- Symbol
- H
- Atomic Mass
- 1.008
- Category
- Reactive Nonmetals
- Standard State
- Gas
- Period
- 1
- Group
- 1
- Electronegativity
- 2.2
- Atomic Radius
- 120
- Ionization Energy
- 13.6
- Electron Affinity
- 0.75
- Oxidation States
- +1, -1
- Melting Point
- 13.81 K (-259.34 °C)
- Boiling Point
- 20.28 K (-252.87 °C)
- Density
- 0.00009
- Electron Configuration
- 1s1
- Year Discovered
- 1766
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Frequently asked questions
What is the atomic number of Hydrogen?
The atomic number of Hydrogen is 1, which equals the number of protons in its nucleus.
What is the atomic mass of Hydrogen?
The atomic mass of Hydrogen is approximately 1.008 u (one twelfth of the mass of a carbon-12 atom).
What is the electron configuration of Hydrogen?
The electron configuration of Hydrogen is 1s1.
Where is Hydrogen in the periodic table?
Hydrogen is located in period 1, group 1.
When was Hydrogen discovered?
Hydrogen was discovered in 1766.
Related elements
Same group
3
Li
Lithium
7
11
Na
Sodium
22.99
19
K
Potassium
39.098
37
Rb
Rubidium
85.468
55
Cs
Cesium
132.905
87
Fr
Francium
223.02