Neon

Koushik 26/06/2026 19:58:08 Updated 26/06/2026 19:58:08

Property	Value
Atomic Number	10
Element	Neon
Symbol	Ne
Atomic Mass	20.180 u
Number of Neutrons	10 (most common isotope, Neon-20)
Number of Protons	10
Number of Electrons	10
Period	2
Group	18
Phase	Gas
Radioactive	No
Natural	Yes
Metal	No
Nonmetal	Yes
Metalloid	No
Type	Noble Gas
Atomic Radius	38 pm
Electronegativity	Not defined
First Ionization Energy	21.565 eV
Density	0.0008999 g/cm³
Melting Point	−248.59 °C
Boiling Point	−246.08 °C
Number of Isotopes	3 (Neon-20, Neon-21, Neon-22)
Discoverer	Morris Travers, William Ramsay
Year	1898
Specific Heat	1.030 J/g·K
Number of Shells	2
Number of Valence Electrons	8