Element Gallium

Gallium ElementIt is a chemical element with the symbol Ga and atomic number 31.
Elemental gallium is a soft, silvery blue metal at standard temperature and pressure; however in its liquid state it becomes silvery white.
It is in group 13 of the periodic table, and thus 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.
Elemental gallium is a liquid at temperatures greater than 29.76 °C (85.57 °F), above room temperature, but below the normal human body temperature of 37 °C (99 °F). Hence, the metal will melt in a person’s hands.

Names and Identifiers

Chemical Formula:Ga
CAS:7440-55-3
Molecular Weight:72.74680 g/mol
EC Number :231-163-8
MDL Number:MFCD00134045
Color:silvery white/ silvery-blue
Other Names:n/a
PubChem CID:23981
IUPAC Name:Gallium
Inchl:InChI=1S/Ga
InChI Key:GYHNNYVSQQEPJS-UHFFFAOYSA-N
Canonical SMILES:[Ga]
ICSC Number:n/a

Physical & Chemical Properties

Phase:Solid
Density:5.91 g/cm3
Boiling Point:2673 K ​(2400 °C, ​4352 °F)
Melting Point:302.9146 K ​(29.7646 °C, ​85.5763 °F)
Molecular Formula:Ga
Flash Point:n/a
Exact Mass:71.94900
Symbol:Globally Harmonized System of Classification
Signal Word:Danger
Hazard Statements:H290-H318
Precautionary Statements:P280-P305 + P351 + P338 + P310
Hazard Codes:Xi:Irritant;
Risk Phrases:R36/37/38
Safety Phrases:S26-S45-S36/37/39-S36-S28-S27
RIDADR:UN 3264 8/PG 3
WGK Germany:3
RTECS:LW8600000
Packaging Group:III
Hazard Class:8

Gallium has 31 known isotopes, ranging in mass number from 56 to 86. Only two isotopes are stable and occur naturally, gallium-69 and gallium-71. Gallium-69 is more abundant: it makes up about 60.1% of natural gallium, while gallium-71 makes up the remaining 39.9%.

Naturally occurring isotopes

IsotopeMass/DaNatural abundance (atom %)Nuclear spin (I)Magnetic moment (μ/μN)
69Ga68.925580 (3)60.108 (9)3/22.01659
71Ga70.9247005 (25)39.892 (9)3/22.56227

Radiosotope data

IsotopeMass/DaHalf-lifeMode of decayNuclear spinNuclear magnetic moment
64Ga63.9368382.63 mEC to 64Zn0
65Ga64.939415.2 mEC to 65Zn3/2
66Ga65.9315929.5 hEC to 66Zn0
67Ga66.9282053.260 dEC to 67Zn3/21.8507
68Ga67.9279831.130 hEC to 68Zn10.01175
70Ga69.92602721.1 mEC to 70Zn; β to 70Ge1
72Ga71.92637214.10 hβ to 72Ge3-0.13224
73Ga72.9251774.87 hβ to 73Ge3/2
74Ga73.926948.1 mβ to 74Ge3
75Ga74.926502.10 mβ to 75Ge3/2

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