Boron

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

Property	Value
Atomic Number	5
Element	Boron
Symbol	B
Atomic Mass	10.81 u
Number of Neutrons	6 (most common isotope, Boron-11)
Number of Protons	5
Number of Electrons	5
Period	2
Group	13
Phase	Solid
Radioactive	No
Natural	Yes
Metal	No
Nonmetal	No
Metalloid	Yes
Type	Metalloid
Atomic Radius	87 pm
Electronegativity	2.04 (Pauling scale)
First Ionization Energy	8.298 eV
Density	2.34 g/cm³
Melting Point	2076 °C
Boiling Point	3927 °C
Number of Isotopes	2 (Boron-10, Boron-11)
Discoverer	Joseph Louis Gay-Lussac, Louis Jacques Thénard
Year	1808
Specific Heat	1.026 J/g·K
Number of Shells	2
Number of Valence Electrons	3