Aluminum

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

Property	Value
Atomic Number	13
Element	Aluminum (Aluminium)
Symbol	Al
Atomic Mass	26.982 u
Number of Neutrons	14 (most common isotope, Aluminum-27)
Number of Protons	13
Number of Electrons	13
Period	3
Group	13
Phase	Solid
Radioactive	No
Natural	Yes
Metal	Yes
Nonmetal	No
Metalloid	No
Type	Post-transition Metal
Atomic Radius	118 pm
Electronegativity	1.61 (Pauling scale)
First Ionization Energy	5.986 eV
Density	2.70 g/cm³
Melting Point	660.32 °C
Boiling Point	2519 °C
Number of Isotopes	2 (Aluminum-27 stable, Aluminum-26 radioactive)
Discoverer	Hans Christian Ørsted
Year	1825
Specific Heat	0.897 J/g·K
Number of Shells	3
Number of Valence Electrons	3