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Gallium and Arsenic – Comparison – Properties

This article contains comparison of key thermal and atomic properties of gallium and arsenic, two comparable chemical elements from the periodic table. It also contains basic descriptions and applications of both elements. Gallium vs Arsenic.

gallium and arsenic - comparison

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Gallium and Arsenic – About Elements


Gallium has similarities to the other metals of the group, aluminium, indium, and thallium. Gallium does not occur as a free element in nature, but as gallium(III) compounds in trace amounts in zinc ores and in bauxite.


Arsenic occurs in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal. Arsenic is a metalloid.

Gallium in Periodic Table

Arsenic in Periodic Table

Source: www.luciteria.com

Gallium and Arsenic – Applications


Gallium consumption is centred on the superconductor industry. Semiconductor applications dominate the commercial demand for gallium, accounting for 98% of the total. When alloyed with arsenic to produce gallium arsenide (GaAs), it can convert electricity to light. Due to such properties, it is used in LEDs, and has been found to produce less heat than silicon, rendering it suitable for use in supercomputers.


Arsenic is used as a doping agent in semiconductors (gallium arsenide) for solid-state devices. It is also used in bronzing, pyrotechnics and for hardening shot. Arsenic compounds can be used to make special glass and preserve wood.

Gallium and Arsenic – Comparison in Table

Element Gallium Arsenic
Density 5.904 g/cm3 5.727 g/cm3
Ultimate Tensile Strength 15 MPa N/A
Yield Strength 8 MPa N/A
Young’s Modulus of Elasticity 9.8 GPa 8 GPa
Mohs Scale 1.5 3.5
Brinell Hardness 60 MPa 1440 MPa
Vickers Hardness N/A N/A
Melting Point 29.76 °C 817 °C
Boiling Point 2204 °C 614 °C
Thermal Conductivity 40.6 W/mK 50 W/mK
Thermal Expansion Coefficient 18 µm/mK 5.6 µm/mK
Specific Heat 0.37 J/g K 0.33 J/g K
Heat of Fusion 5.59 kJ/mol N/A
Heat of Vaporization 258.7 kJ/mol 34.76 kJ/mol