Atomic NumberAtomic Number 2
Atomic Number 2 is belong to element of Helium.
Chemical symbol for Helium is He. Number of protons in Helium is 2. Atomic weight of Helium is 4.002602 u or g/mol.
2He
Atomic Number 2 Element Properties
| Atomic Number (Z) | 2 |
|---|---|
| Atomic Symbol | He |
| Element Name | Helium |
| Group | 18 |
| Period | 1 |
| Atomic Weight | 4.002602 u |
| Density | 0.0001785 g/cm3 |
| Melting Point (K) | K |
| Boiling Point (K) | 4.22 K |