The _________________ element is radioactive nature in group 2.
Calcium(Ca)
Strontium(Sr)
Barium(Ba)
Radium(Ra)
For which element the density (g cm-3) (at 293 k) is 1.90?
Caesium
Sodium
Potassium
Rubidium
What is the electronegativity(Pauling scale) of sodium?
0.79
0.82
0.93
0.98
What is the electronic configuration of rubidium?
1s2 2s1
1s2 2s2 2p6 3s1
1s2 2s2 2p6 3s2 3p6 4s1
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s1
Lithium chloride form _____________.
Li2O.
NO2
LiCl.2H2O.
LiCl.
What is the electronic configuration of potassium?
What is the electronic configuration of Lithium?
_______________ is much less abundant element in earth crust.
Lithium.
Sodium.
Potassium.
Rubidium.
Lithium is the only alkali metal which reacts with nitrogen to form a _____________.
Nitride.
Monoxide.
Peroxides.
Superoxides.
Which one of the following is important ore of the sodium?
Sylvine
Carnalite.
Chile salt petre.
Felspar
