Atomic Properties of Ga
- Atomic Number of Ga
- 31
- Atomic Mass of Ga
- 69.7230 u
- Electron Configuration
- [Ar] 3d10 4s2 4p1
- Electronegativity
- 1.81
- Block
- p-block
- Group
- 13
- Period
- 4
Gallium melts at about 29.8 degrees Celsius, so a warm hand can turn a solid piece into a silvery liquid. It does not boil until a much higher temperature, giving liquid gallium an unusually broad range. The demonstration needs boundaries: gallium wets surfaces, stains skin, and diffuses into metals such as aluminum, weakening their structure. A melting spoon is memorable; using gallium near valuable metal objects is not harmless play.
The metal itself is not the heart of most electronics. Gallium arsenide, gallium nitride, and related compounds are semiconductors with properties distinct from elemental gallium. Gallium arsenide supports high-frequency electronics, lasers, and efficient specialized solar cells. Gallium nitride handles high electric fields and powers blue and ultraviolet LEDs, radio-frequency devices, and increasingly efficient power electronics. Bonding with another element creates the useful crystal and band structure.
Mendeleev predicted an element below aluminum and called it eka-aluminum. In 1875, Paul-Émile Lecoq de Boisbaudran found new violet spectral lines in zinc ore and isolated gallium, closely matching the prediction. The name refers to Gallia, Latin for France.
Gallium is dispersed through bauxite, zinc ores, and coal rather than concentrated in rich gallium mines. It is recovered mainly as a by-product, making supply depend on other industries and careful recycling of manufacturing scrap. Gallium-69 and gallium-71 are stable; short-lived gallium-68 is widely used in PET imaging through generator systems.
Gallium is a Tinkerer of thresholds. Body heat crosses its melting point, trace recovery creates a critical supply, and compound formation turns an unusual metal into light-emitting and high-power technology.