minus platium
Pt
Platinum is a metal element. Atomic mass of it is 195.
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.