i need some chemistry help pliiiiiiiiiiz?

Question

what are the names of the following polyatomic ions?
CuO
HgSO4
and Identify and name the cations and anions that make up the following ionic compounds and indicate the charge on each ion
KMnO4
NaNO3
Na2S2O3
(NH4)2CrO4

pliiiiiz i looked already everywhere but couldn't find it

I tried cuprous oxide and everything
i tried to use common sense by putting the first name of the ion and then the next but it's still wrong

Answer 1

CuO - copper (II) oxide or cupric oxide
HgSO4 - mercury (II) sulfate or mercuric sulfate

KMnO4 - K+ MNO4-, Potassium permanganate
NaNO3 - Na+ NO3-, Sodium Nitrate
Na2S2O3 - 2Na+ S2O3 2-, Sodium Thiosulphate
(NH4)2CrO4 - 2 NH4- CrO4 2-, Ammonium Chromate

As a note: Using Wikipedia to search for compounds or the ions will help.

Answer 2

Cupurous Oxide

Answer 3

Looking won't give the answer. You need to work them out for yourself. For example:
CuO is a combination of copper and oxygen, both with a valency of 2. So does this make it cupric oxide or cuprous oxide?

Now stop being mentally lazy, and work them all out for yourself. You might even learn something, just telling you won't do a thing for your knowledge base.

Answer 4

Cupurous Oxide
Mercury Sulfate