Lithium is the __________________ most abundant element in earth crust.
Seventh.
Eighth.
Thirty fifth.
Ninth
All alkali metals dissolve in _________________ to form deep blue coloured solutions which are highly conducting.
Ammonia.
Liquid ammonia.
Hydroxides.
None of the above.
What is the M - H bond energy (kJ mol-1) of PH3?
391
322
247
255
Higher the charge on cation and anoin,_____________ is the extent of polarisation.
Greater.
Smaller.
May greater or smaller.
What is the electronic configuration of francium?
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6 7s1
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s1
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 6s1
1s2 2s2 2p6 3s1
Which one the following elements are present in group 1 or 1 A?
Lithium
Rubedium
Francium
Sodium
What is the electronic configuration of potassium?
1s2 2s1
1s2 2s2 2p6 3s2 3p6 4s1
For which element the atomic radius is 265?
Caesium.
Potassium
Rubidium
For which element the ionic radius is 167?
Sodium.
Rubidium.
Alkali metals readily combine with halogens to form____________________ of the type MX.
Saline hydrides.
Halides.
Hydrogen peroxide.
