Chemical formula of cadmium?
Cadmium is a metallic element, so it just exists in a solid form, held by metallic bonding.
The symbol for the element is Cd.
Cadmium nitrate, which has Cd(NO3)2 for a chemical formula, has a total of 9 atoms in it. There is one cadmium (Cd) atom, and the nitrate radical (NO3) has a nitrogen (N) atom and 3 oxygen (O) atoms in it for a total of 4. But it takes 2 nitrate radicals to balance the equation, and that makes for a nine atom total.