Magnesium

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

Property	Value
Atomic Number	12
Element	Magnesium
Symbol	Mg
Atomic Mass	24.305 u
Number of Neutrons	12 (most common isotope, Magnesium-24)
Number of Protons	12
Number of Electrons	12
Period	3
Group	2
Phase	Solid
Radioactive	No
Natural	Yes
Metal	Yes
Nonmetal	No
Metalloid	No
Type	Alkaline Earth Metal
Atomic Radius	145 pm
Electronegativity	1.31 (Pauling scale)
First Ionization Energy	7.646 eV
Density	1.738 g/cm³
Melting Point	650 °C
Boiling Point	1091 °C
Number of Isotopes	3 stable (Magnesium-24, Magnesium-25, Magnesium-26)
Discoverer	Joseph Black
Year	1755
Specific Heat	1.023 J/g·K
Number of Shells	3
Number of Valence Electrons	2