JAMB - Chemistry (2020 - No. 8)
What are the possible oxidation numbers of an element if its atomic number is 17?
-1 and 7
-1 and 6
-3 and 5
-2 and 6
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The element with atomic number 17 is Chlorine with a valency of -1, that is it needs to receive an electron or possibly lose seven electrons to obey the octet rule.