how do i name this chemical?
Fe(NO3)2
It'd be Iron Nitrate, but more precisely, Iron (II) Nitrate
Ferrous Nitrate (Iron+2) Fe(NO3)2
Ferric Nitrate (Iron +3) Fe(NO3)3
although what Steve said is fine.
To name the chemical Fe(NO3)2, you need to break down the compound and determine the names of each individual component.
1. Identify the central metal ion in the compound, which is Fe. In this case, Fe represents iron.
2. Identify the polyatomic ion present in the compound, which is NO3. The NO3 ion is called nitrate.
3. Determine the oxidation state of the central metal ion. In this case, Fe has a +2 charge because there are two nitrate ions (NO3) with a charge of -1 each.
4. Combine the names of the metal ion and the polyatomic ion. The convention for naming compounds with a metal ion of fixed oxidation state is to use Roman numerals in parentheses to indicate the charge. Since Fe has a +2 charge, the name will be "iron(II)".
5. Finally, add the name of the polyatomic ion after the metal ion's name. Therefore, the name of Fe(NO3)2 will be "iron(II) nitrate."
Note: It is always important to specify the charge of transition metals when naming compounds since they can exhibit different oxidation states.