Determine the oxidation number of each atom in the following substances:

Question

NF3: N__ F__
K2CO3: K__ C__ O__
HlO4: H__ I__ O__
Br2: Br__
2Nal: Na__ l__
I2: I__
2NaBr: Na__ Br__
Fe2O3: Fe__ O__
2Al: Al__
Al2O3: Al__ O__
2Fe: Fe__

Answer 1

To determine the oxidation numbers of each atom in the given substances, we'll follow the rules for assigning oxidation states. Here are the oxidation numbers for each atom in the specified substances:

1. NF3:

   • N: +3
   • F: -1 (each fluorine atom)

2. K2CO3:

   • K: +1 (each potassium atom)
   • C: +4
   • O: -2 (each oxygen atom)

3. HlO4:

   • H: +1
   • I: +7
   • O: -2 (each oxygen atom)

4. Br2:

   • Br: 0 (elemental form)

5. 2NaI:

   • Na: +1 (each sodium atom)
   • I: -1 (each iodine atom)

6. I2:

   • I: 0 (elemental form)

7. 2NaBr:

   • Na: +1 (each sodium atom)
   • Br: -1 (each bromine atom)

8. Fe2O3:

   • Fe: +3 (each iron atom)
   • O: -2 (each oxygen atom)

9. 2Al:

   • Al: 0 (elemental form)

10. Al2O3:

    • Al: +3 (each aluminum atom)
    • O: -2 (each oxygen atom)

11. 2Fe:

    • Fe: 0 (elemental form)

To summarize, here are the oxidation numbers for quick reference:

• NF3: N(+3), F(-1)
• K2CO3: K(+1), C(+4), O(-2)
• HlO4: H(+1), I(+7), O(-2)
• Br2: Br(0)
• 2NaI: Na(+1), I(-1)
• I2: I(0)
• 2NaBr: Na(+1), Br(-1)
• Fe2O3: Fe(+3), O(-2)
• 2Al: Al(0)
• Al2O3: Al(+3), O(-2)
• 2Fe: Fe(0)