Consider the elements:
Cs, Ne, I and F
Identify the element that exihibits only negative oxidation state.
Identidy the elements that exihibits only positive oxidation state.
Identify the element that exhibits both positive and negative oxidation states.
Identify the element which exihibits neither the negative nor does the positive oxidation state
F exhibits only negative oxidation state of -1.
Cs exihibits positive oxidation state of +1.
I exhibits both positive and negative oxidation states. It exhibits oxidation states of -1, +1, +3, +5 and +7.
The oxidation state of Ne is zero. It exihibits neither negative nor positive oxidation states.