Question

 

The successive ionisation energy values for an element ‘X’ are given below: 

1st ionisation energy = 410 kJ mol–1

2nd ionisation energy = 820 kJ mol–1

3rd ionisation energy = 1100 kJ mol–1

4th ionisation energy = 1500 kJ mol–1

5th ionisation energy = 3200 kJ mol–1

Find out the number of valence electrons for the atom ‘X’. 

Solution

Correct option is

4

In the given values, there is a biggest jump between IE4 and IE5. Hence, there are four valence electrons for the atom X.

SIMILAR QUESTIONS

Q1

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+

Q2

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

Q3

Which is likely to show inert pair effect?

Q4

The correct order of the size of iodine species is

Q5

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

Q6

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

Q7

The element having highest electron affinity is

Q8

Diagonal relationship is for

Q9

The correct order according to size is

Q10

In which of the following arrangement the order is not according to the property indicated against it?