oxidation number

    Cards (4)

    • OXIDATION NUMBER - To track the electrons in compounds and reactions especially compounds part of a covalent bond (sharing of electrons) chemist devised a tool to help track electrons trough assigning “fictional charge” to an atom.
    • it is assumed that oxidation number is the charged given to elements would have if the molecule was ionic.
    • The term oxidation was first used by Antoine Lavoisier to signify the reaction of a substance with oxygen.
    • RULES FOR GETTING OXIDATION NUMBER
      1. Elements by itself: 0 (e.g., Cl2, Na, S6, P4 )
      2. Elements in Group 1-A: +1
      3. Elements in Group 2-A: +2
      4. Halogens (Group 17A) is usually -1, but +1 with oxygen or except when a central atom or when combined with a more electronegative element
      5. Monoatomic ion is equal to its ion charge (e.g., K+ =+1, Mg 2+=2+)
      6. Hydrogen is usually +1, with non metals. -1 with metals.
      7. Oxygen: usually -2,
      8. Fluorine: always -1
      9. Sum Of oxidation number for neutral compound is zero
      10. Sum of oxidation number for polyatomic ion is equal to its ion charge