Ga
Gallium is a metal element. Atomic mass of it is 70.
The element gallium derives its name from the Latin word "Gallia," which means France. This is in reference to its discovery by French chemist Paul-Émile Lecoq de Boisbaudran in 1875.
ClO4- Note that this is not an "element" and hence doesn't have an "element symbol."
The symbol of helium is he
There is no element with symbol a or A even
The chemical symbol for the element Xenon is Xe.
Take the element "Iron" then the symbol for the element is "Fe" and "Fe" is also the symbol for a single atom of the element in a chemical equation.
O is the the symbol of the element oxygen.
B is the symbol for which element?Boron
The symbol for the element Terbium is Tb
The element symbol for barium is Ba.
If you meant "element" as in a chemical element, there is no element with the symbol "ef" in the periodic table.