31
Ga
69.723
Gallium (Ga)
Element 31 · Period 4 · Group 13
post-transition
solid at room temp
p-block
About Gallium
Melts just above room temperature. Used in semiconductors, LEDs, and solar panels.
Physical Properties
Atomic Mass
69.723 u
State at 25°C
Solid
Melting Point
29.76 °C
Boiling Point
2204 °C
Density
5.91 g/cm³
Magnetism
Diamagnetic
Atomic Properties
Electron Configuration
[Ar] 3d¹⁰ 4s² 4p¹
Electron Shells
2, 8, 18, 3
Electronegativity
1.81
Atomic Radius
136 pm
Ionization Energy
579 kJ/mol
Oxidation States
+3
Discovery & History
Discovered By
Paul Emile Lecoq de Boisbaudran
Discovery Year
1875
Named By
Paul Emile Lecoq de Boisbaudran
Name origin: Latin: Gallia (France)
Frequently Asked Questions
- Is Gallium a metal, nonmetal, or metalloid?
- Gallium is classified as a post-transition.
- What state is Gallium in at room temperature?
- Gallium is a solid at standard room temperature (25°C).
- What is the atomic mass of Gallium?
- Gallium has an atomic mass of 69.723 atomic mass units (u).
- Who discovered Gallium?
- Gallium was discovered by Paul Emile Lecoq de Boisbaudran in 1875.
- Where is Gallium on the periodic table?
- Gallium is element number 31, located in period 4 and group 13.