Essential Chemistry for IGCSE - Chemical Reactions (Section 4 - No. 39)
Which statement(s) about oxidation numbers is/are true?
The oxidation number of an element in its elemental form is zero.
The sum of the oxidation numbers in a neutral compound is zero.
The oxidation number of an element in a compound is the charge the atom would have if the bonds were completely ionic.
The oxidation number is always a positive integer.
Explanation
The oxidation number of an element in its elemental form is 0. The sum of oxidation numbers in a neutral compound is 0, and in an ion, it equals the ion's charge. The oxidation number can be positive, negative, or zero.
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