_______________ is much less abundant element in earth crust.
Lithium.
Sodium.
Potassium.
Rubidium.
For which element the second ionization enthalpy (KJ mol-1) is 2230?
Caesium
Sodium
Potassium
Rubidium
For which element the electro negativity is 0.79?
LiF is insoluble in water due to its _________________.
Low lattice energy.
Very low lattice energy.
High lattice energy.
Very high lattice energy.
Which one the following elements are present in group 1 or 1 A?
Lithium
Rubedium
Francium
The polarising power of a cation having outermost shell configuration of the type_____________.
s2 p6 d7.
s2 p5 d9.
s2 p6 d10
s2 p6 d8.
For which element the density (g cm-3) (at 293 k) is 1.53?
What is the atomic number of francium?
11
55
37
87
______________ is the fifth most abundant element in earth crust.
Magnesium.
Calcium.
Strontium.
Barium.
The diagonally opposite elements possess almost similar polarizing powers due to comparable sizes of their _____________.
Anions.
Cations.
Metals.
None of the above.
