Loss of electrons results in an atom or ion that is

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loss of electrons  results in an atom or ion that is  less negative the atom or ion oxidized   is the one whose  oxidation number increases  or becomes less  negative Reduction –  the process by which atoms or ions attain a more negative (or less positive) oxidation state the  gain of electrons  results in an atom or ion that is  more negative the atom or ion reduced is the one whose  oxidation number decreases or becomes more negative Activity:  Assigning Oxidation Numbers Use the Rules for Assigning Oxidation Numbers  to assign oxidation numbers to EACH element in each of  the given formulas below. 1. Cl 2                                                    2. Cl -                                                    3. Na                                                   
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4. Na +                                                    5. KCl                                                    6. H 2 S                                                    7. CaO                                                    8. H 2 SO 4                                                    9. NO 3 -                                                    10. PO 4 - 3                                                    11. Cr 2 O 7 - 2                                                    12. NH 4 Cl                                                    13. NH 3                                                    14. NO 2                                                    15. CaH 2                                                    16. Na 2 O 2                                                   
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