Periodic Proper...

The elements with atomic numbers 9, 17, 35, 53 and 85 are all

Amongst the following elements (whose electronic configurations are given below), the one having the highest ionization enthalpy is

The polarizing power of the anions N^3-, O^2- and F^-, follows the order

Which of the following is a set of isoelectronic species (At. No. of Cs = 55, Br = 35)?

The formation of oxide ion O^2- (g) requires first an exothermic and then an endothermic step as shown below:

O (g) + e^- → O^- (g) ΔH_o = - 142 kJ/mol
O^- + e^- → O^2- (g) ΔH_o = + 844 kJ/mol

This is because

For P^3-, S^2- and Cl^- ions, the increasing order of size is

The correct order of increasing radii of the elements Na, Rb, K and Mg is

The correct order of increasing radii of the elements Na, Si, Al and P is

In which of the following pairs is the first atom or ion not larger than the second?

The ionisation enthalpy of nitrogen is more than that of oxygen because of