Which of the following is/are correct order?

Options

A. Atomic rdius `F lt O lt F^(-) lt O^(2-)`
B. 2nd ionisation energy `C lt N lt F lt O`
C. Electron affinity: `I lt Br lt F lt Cl`
D. `Z_(ef f)` (effective nuclear change): `Al lt Al^(+) lt Al^(3+) lt Al^(2+)`

Answer

A, B, C

Explanation

(a) The radius of isoelectronic species `prop(1)/(""_(e)^(z)"ratio")`
(b) Ionisation energy `prop(1)/("size")prop`Effective nuclear charge
(c) Normally the electron afinity `(E_(A)) prop(1)/("Size of atom")`