Atomic Number: 31

Atomic Weight: 69.723

Melting Point: 302.91 K (29.76°C or 85.57°F)

Boiling Point: 2477 K (2204°C or 3999°F)

Density: 5.91 grams per cubic centimeter

Phase at Room Temperature: Solid

Element Classification: Metal

Period Number: 4

Group Number: 13

Group Name: none

Gallium has two stable isotopes and both are used in nuclear medicine and physics. Ga-69 is used for production of the radioisotope Ge-68. This isotope is used for so-called Ge-68/Ga-68 generators. The Ga-68 that is created from the decay of Ge-68 is used as a PET isotope. Ga-71 has been used to study the behavior of solar neutrinos and it is also used in NMR studies.