Question

Which of the following elements will have the lowest first ionisation energy?

Solution

Correct option is

Rb

IE decreases in a group and increases in a period. Thus, Rb has the lowest IE.

SIMILAR QUESTIONS

Q1

If Aufbau rule is not followed, K-19 will be placed in

Q2

Which of the following has largest size?

Q3

Which of the following has largest ionic radius?

Q4

Which of the following ion is the smallest ion?

Q5

Which of the following is the smallest in size?

Q6

The smallest among the following ions is

Q7

In the isoelectronic species the ionic radii (Å) of N3–, O2– and F are respectively given by   

Q8

The trivalent ion having largest size in lanthanide series is

Q9

A sudden large jump between the values of second and third ionisation energies of an element would be associated with the electronic configuration 

Q10

The correct order of ionisation energy for comparing carbon, nitrogen and oxygen is