Question

Arrange the following species in the increasing order of size
a) O²⁻, F⁻, Mg²⁺, Na⁺
b) F, F⁻
c) N, O
d) Fe²⁺, Fe, Fe³⁺
e) Na⁺, CI⁻, Na, CI
f) I, I⁺, I⁻

Answer 1

Concept :- For isoelectronic species the ionic radii decreases with increase in atomic number i.e nuclear charge.
[isoelectronic species means number of electrons are same in all species ]

(a) O²⁻, F⁻, Mg²⁺, Na⁺
you observed these are isoelectronic species .
increasing order based on atomic number : O²⁻, F⁻, Na⁺ , Mg²⁺
so, increasing order of their size : Mg²⁺ , Na⁺, F⁻ , O²⁻

(b) adding the electron in any species , size will be increase
so, increasing order of size : F , F⁻

(c) From left to right in periodic table size of atom decreases.
so, increasing order of size : O , N

(d) Cations lose electrons and are smaller in size than the parent atom
so, increasing order of size :- Fe³⁺ , Fe²⁺ ,Fe

(e) increasing order of their size :- Cl, Na⁺ , Na , Cl⁻

(f) increasing order of their size :- I⁺, I , I⁻

Answer 2

Answer:

1. a) Mg2+, Na+, F-, O2-
2. b) F, F-
3. c) N, O
4. d) Fe3+, Fe2+, Fe
5. e) Na+, Cl, Na, Cl-
6. f) I+, I, I-

Explanation:

I hope this is the right ans..... plz confirm the ans given by the other person i feel they are wrong...