Answer:
1. ClF₅ ; 2. TeF₆ ; 3. S₂F₁₀ ; 4. P₄O₁₀ ; 5. Br₂O ; 6. H₂S₂ ; 7. SO ; 8. NO₃ ;
9. S₂O ; 10. C₃N₄
Explanation:
Let's count the atoms, by the name
1. Chlorine Pentaflouride
1 Cl and 5F → ClF₅
2. Tellurium Hexafluoride
1 Te and 6F → TeF₆
3. Disulfur decafluoride
2 S and 10 F → S₂F₁₀
4. Tetraphophorus Decaoxide
4 P and 10 O → P₄O₁₀
5. Dibromine Monoxide
2 Br and 1 O → Br₂O
6. Dihydrogen Disulfide
2 H and 2 S → H₂S₂
7. Sulfur monoxide
1 S and 1 O → SO
8. nitrogen trioxide
1 N and 3 O → NO₃
9. oxygen monosulfide
1 O and 1 S₂ → S₂O
10. tricarbon tetranitride
3 C and 4 N → C₃N₄