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mineralogy elements He Helium

He - Helium - NO NOBLE GAS METAL

Helium, a noble gas, is the chemical element with atomic number 2, symbol He. Helium is the second most abundant element in the universe. This element was first highlighted in 1868 in the spectrum of the sun. Helium is at room temperature a transparent and odorless gas, it is not toxic.
4.002602
0
2
He
1s2
2
0
24.5874
Synthetic
Radioactive
Liquid
Gaseous
Helium Electronic configuration diagram
Electronic configuration diagram

Name Helium
Number 2
Atomic 4.002602
Symbol He
Fusion -272.2
Boiling -268.9
Density 0.0001785
Period 1
Group 18
Discovery 1868 Janssen
Abundance 0.008
Radius 0.49
Electronegativity 0
Ionization 24.5874
Number of isotopes 5
Electronic configuration 1s2
Oxidation states 0
Electron by energy level 2