Atoms, Molecules, and Ions: Exercises

• 1($) refers to carbon monoxide, a molecule composed of one carbon and one oxygen atom.
• 2($) refers to cobalt, a chemical element on the periodic table.

What is the difference between H₂O and H₂O₂ (hydrogen peroxide)?

• 1($) represents a molecule of water, consisting of two hydrogen atoms bonded to one oxygen atom.
• 2($) (hydrogen peroxide) represents a molecule of hydrogen peroxide, consisting of two hydrogen atoms bonded to two oxygen atoms.

1. 1($) Hydrogen
2. 2($) Nitrogen
3. 3($) Oxygen
4. 4($) Fluorine 
5. 5($) Chlorine
6. 6($) Bromine
7. 7($) Iodine

Why is sulfur not considered a diatomic element?

Answer: while sulfur can form diatomic molecules like S2, it's not considered a diatomic element under standard Earth conditions because it's not the most stable form of sulfur in those conditions

1. 1($) PF₃
2. 2($) TeCl₂
3. 3($) N₂O₃

1. 1($) NO
2. 2($) CS₂
3. 3($) As₂O₃

1. 1($) XeF₂
2. 2($) O₂F₂
3. 3($) SF₆

1. 1($) P₄O₁₀
2. 2($) B₂O₃
3. 3($) P₂S₃

1. 1($) N₂O
2. 2($) N₂O₄
3. 3($) N₂O₅

1. 1($) SeO₂
2. 2($) Cl₂O
3. 3($) XeF₆

1. 1($) Dinitrogen Pentoxide
2. 2($) Tetraboron Tricarbide
3. 3($) Phosphorus Pentachloride

1. 1($) Nitrogen Triiodide
2. 2($) Diarsenic Trisulfide
3. 3($) Iodine Trichloride

1. 1($) dioxygen dichloride
2. 2($) dinitrogen trisulfide
3. 3($) xenon tetrafluoride

1. 1($) Chlorine Dioxide
2. 2($) Selenium Dibromide
3. 3($) Dinitrogen Trioxide

1. 1($) Iodine Trifluoride
2. 2($) Xenon Trioxide
3. 3($) Disulfur Decafluoride

1. 1($) Germanium Dioxide
2. 2($) Carbon Disulfide
3. 3($) Diselenium Dibromide