Question

the ion is largest radius is 9​

Answer 1

Answer:

Atomic radius increase down a group as the number of electrons increases.

For isoelectronic species, anions are larger than the neutral atom which in turn is larger than the cations.

Consider all the options:-

A) Cl

−

→ Anion with 18e

−

.

B) S

2−

→ Anion with 18e

−

.

C) Na

+

→ Cation with 10e

−

.

D) F

−

→ Anion with 10e

−

.

As reasoned above, species with 18e

−

are larger than species with 10e

−

. Hence, the largest species is either Cl

−

or S

2−

. Since in the case of S

2−

there will be greater electron-electron repulsion, S

2−

will be larger than Cl

−

.

Hence, option B is the right answer.

Answer 2

Answer:

The ionic radii of cations follow the same trends as atomic radii. They increase from the top to bottom & from right to left in the Periodic table. Thus, the ion with the largest radius is closet to the lower left corner of the Periodic table, & that is the K+ion.

Hope it helps you mate............