The group 1 or group I A of the periodic table consist of _______________.
Six elements.
Four elements.
Seven elements.
Eight elements.
Magnesium is also occurs to an extent of ____________ in sea water as chloride and sulphate.
0.15%.
0.13%.
0.16%.
0.17%.
What is the first ionization enthalpy (KJ mol-1) of caesium?
496
520
376
419
For which element the atomic radius is 375?
Lithium
Sodium.
Francium
Rubidium
What is the electronic configuration of potassium?
1s2 2s1
1s2 2s2 2p6 3s1
1s2 2s2 2p6 3s2 3p6 4s1
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s1
Lithium.
Sodium
_______________ is much less abundant element in earth crust.
Potassium.
Rubidium.
The diagonally opposite elements possess almost similar polarizing powers due to comparable sizes of their _____________.
Anions.
Cations.
Metals.
None of the above.
Beryllium is mainly found as _____________
Beryl.
Chrysoberyl.
Phenacite.
All the above.
_________________ is the eighth most abundant element in earth crust.
