Anyone can check my CHEMISTRY homework? please?(IONIC AND COVALENT COMPOUNDS)?

[Konrad J]

Please let me know which I have wrong, I would like to know as I have a test tomorrow

Naming compounds:
1. Mn2Se3=Manganese Selenide
2. (NH4)3AsO3= Ammonium III Arsenite
3. Cr(OH)3=Chromium Hydroxide
4. Si2O4= Disilicon Tetroxide
5. CoBr2= Cobalt Bromide
6. RaC2O4= Radium Oxalate
7. S2P6= Disulfur Hexaphospherus
8. Pb(HSO3)2= Lead II Bisulfate
9. K3As= Tripotassium Arsenide
10. P4O10= Tetraphospherus Decaoxide

Now formulas for following:
11. Pentaphosphorus nonasulfide= P5S9
12. Mercury II Phosphite= Hg(PO3)2
13 Cobalt II Fluoride= CoF2
14. Boron Triiodide= BI3
15. Nickel II Bromide= NiBr2
16. Carbon Disulfide= CS2
17. Potassium Chlorite= KClO2
18. Tin IV Phosphide= SnP4
19. Silver Sulfite= AgSo3
20. Tellurium Monoxide= ??