Which Is The Correct Order Of Electronegativity?

The correct order of the size of iodine species is

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

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

The element having highest electron affinity is

Diagonal relationship is for

The correct order according to size is

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

1^st ionisation energy = 410 kJ mol^–1

2^nd ionisation energy = 820 kJ mol^–1

3^rd ionisation energy = 1100 kJ mol^–1

4^th ionisation energy = 1500 kJ mol^–1

5^th ionisation energy = 3200 kJ mol^–1

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

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

The set representing the correct order of first ionisation energy is

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