In the long form of periodic table, the elements having lowest ionisation potential are present in :<br>

Al³⁺ion has a lower ionic radius than Mg²⁺ ion because :

An oxide of an element is a gas and dissolves in water to give an acidic solution. The element belongs to

Observe the following statements :<br>I.&nbsp;&nbsp; &nbsp;The physical and chemical properties of elements are periodic functions of their electronic configuration.<br>II.&nbsp;&nbsp;&nbsp; Electronegativity of fluorine is less than the electronegativity of chlorine.<br>III.&nbsp;&nbsp; Electropositive nature decreases from top to bottom in a group.<br>The correct answer is :

Which one of the following order is correct for the first ionization energies of the elements

The order of decrease in atomic radii for Be;Na;Mg is

Which of the following has the highest first IP

Let electronegativity, ionisation energy and electron affinity be represented as EN, IP and EA respectively. Which one of the following equation is correct according to Mulliken?