Arrange these species in the order of increasing size: (i) Ar, Cl- , K+ , S2-, Ca2+
(ii) Fe, Fe2+, Fe+
(iii) Na, Rb, K
(iv) N, C, O, B, F

Just Note the below follow the below principle

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it means there are 3 atoms of oxygen

girl imma just put my comment here because i need a couple point okurrttt