The one you are thinking of is probably the trefoil symbol, three black foils on a yellow background. See link below
Gallium has two isotopes, gallium-69 and gallium-71. With an atomic number of 31 this means that gallium-69 has 38 neutrons, and gallium-71 has 40.
Examples: see the list of gallium isotopes at link below.
-1e
Ga
31Ga71
204/80 Hg^2+
5%
No
The element is gallium and the isotope is 31Ga70
There are many compounds with a relative mass of 72.Eg. pentane (C5H12), methyl butane (CH3)-(C4H9), dimethyl propane (CH3)2-(C3H6). Inorganic formula's can not easily be guessed, but undoubtly be found.Only one (isotope of an) element has the relative mass of 72: Gallium, (Ga-72), but this is not a natural, stable isotope. Gallium has not a molecular formula (being a metal like aluminum) only an atomic symbol: Ga.
Ca Calcium
204/80 Hg^2+
5%
No
The element is gallium and the isotope is 31Ga70
Gallium is represented by Symbol Ga.It has atomic number of 31.It belongs to group of post transition metals.
1- the name then the nuclear symbol.
A gallium scan of the body is a nuclear medicine test that is conducted using a camera that detects gallium, a form of radionuclide, or radioactive chemical substance.
Gallium scan
Formula: GaI3
The chemical symbol of actinium is Ac.The symbol of an isotope:- as superscript to the left of Ac is the atomic mass of the isotope- as subscript to the left of Ac is the atomic number 89
Gallium (Ga) is a chemical element, a metal.