5
B
10.81
Boron (B)
Element 5 · Period 2 · Group 13
metalloid
solid at room temp
p-block
About Boron
Metalloid essential for plant growth. Used in glass, ceramics, and nuclear control rods.
Physical Properties
Atomic Mass
10.81 u
State at 25°C
Solid
Melting Point
2076 °C
Boiling Point
3927 °C
Density
2.34 g/cm³
Magnetism
Diamagnetic
Atomic Properties
Electron Configuration
[He] 2s² 2p¹
Electron Shells
2, 3
Electronegativity
2.04
Atomic Radius
87 pm
Ionization Energy
800 kJ/mol
Oxidation States
+3
Discovery & History
Discovered By
Joseph Louis Gay-Lussac
Discovery Year
1808
Named By
Humphry Davy
Name origin: Arabic: buraq (borax)
Frequently Asked Questions
- Is Boron a metal, nonmetal, or metalloid?
- Boron is classified as a metalloid.
- What state is Boron in at room temperature?
- Boron is a solid at standard room temperature (25°C).
- What is the atomic mass of Boron?
- Boron has an atomic mass of 10.81 atomic mass units (u).
- Who discovered Boron?
- Boron was discovered by Joseph Louis Gay-Lussac in 1808.
- Where is Boron on the periodic table?
- Boron is element number 5, located in period 2 and group 13.