Question

The order of first ionisation energies of the elements Li, Be, B, Na is

Solution

Correct option is

Be > B > Li > Na

 

Ionisation energies increase in a period on moving left to right while these decrease in a group on moving downward. The IE of Be is greater than B due to completely filled s-orbital. Hence, the order of IE is as

                              Be > B > Li > Na

SIMILAR QUESTIONS

Q1

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

Q2

The element having highest electron affinity is

Q3

Diagonal relationship is for

Q4

The correct order according to size is

Q5

 

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’. 

Q6

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

Q7

Which is the correct order of electronegativity?

Q8

The set representing the correct order of first ionisation energy is

Q9

An element with atomic number 106 has been discovered recently. Which of the following electronic configurations will it possess?

Q10

The ionic radius of ‘Cr’ is minimum in which of the following compounds?