a) F is the element that exhibits only negative oxidation state of –1.
b) Cs is the element that exhibits positive oxidation state of +1.
c) I is the element that exhibits both positive and negative oxidation states. It exhibits oxidation states of – 1, + 1, + 3, + 5, and + 7.
d) The oxidation state of Ne is zero. It exhibits neither negative nor positive oxidation states. Hence, Ne is the element that exhibits neither the negative nor does the positive oxidation state.
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