Question

In which one of the following pairs the radius of the second species is greater than that of the first?

Solution

Correct option is

O2–, N3–

O2– and N3– both are isoelectronic but differ in the charge possessed by them. As the negative charge increases, the electrons are held less and less tightly by the nucleus, therefore, radius increases form O2– to N3–.

SIMILAR QUESTIONS

Q1

The correct order of ionisation energy of C, N, O, F is

Q2

The electron affinity values (in kg mol–1) of three halogens XY and Z are respectively –349, –333 and –325. Then XY and Z respectively, are

Q3

Which of the following has the highest second ionisation energy?

Q4

The electronic configuration of the element with maximum electron affinity is

Q5

The first ionisation energy of oxygen is less than that of nitrogen. Which of the following is the correct reason for this observation?

Q6

The charge/size ratio of a cation determines its polarizing power. Which one of the following sequences represents the increasing order of the polarizing power of the cationic species, K+, Ca2+, Mg2+, Be2+

Q7

Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species?

Q8

Which is likely to show inert pair effect?

Q9

The correct order of the size of iodine species is

Q10

The increasing order of the first ionisation enthalpies of elements B, P, S and F (lowest first) is