The correct order of density is :
(1) Li > Na
(2) K> Na
(3) Mg > Ca
(4) Cs < Rb

The correct order of ionic size of N^(3-), Na^(+), F^(-), Mg^(2+) and O^(2-) and is :

The correct order of electropositive nature of Li,Na and K is

The correct order of energy of 2s orbitals in H,Li,Na and K, is

The correct order of decreasing radius of aquated Na^(+), K^(+) " and " Li^(+) is:

The correct order of density of following elements is: - (Be,Mg,Ca,Sr)

The correct order of third ionization energies (IE_3) of Na, Mg and Al is

The correct order of the ionic radii of O^(-2), N^(3-) , F^(-), Mg^(2+) , Na^(+) and Al^(3+) is .

Arrange the followin in the decreasing order of the property mentioned : (i) Li^(+), Na^(+), K^(+), Rb^(+) (Ionic mobility ) (ii) Be , Mg , Ca , Sr ( Melting point ) (iii) BeO , MgO , CaO (Enthalpy of formation ) (iv) Be , Mg , Ca ( Metallic radius )