For which element the boiling point is 978.0?
Caesium
Sodium
Potassium
Rubidium
The first member of the group beryllium is the _______________most abundant element in earth crust.
Fifty.
Fifty one.
Fifty two.
Fifty three.
Lithium reacts with bromine slowly and decomposes water slowly at ___________.
200 K
300 K.
400 K.
500 K.
What is the electronic configuration of caesium?
1s2 2s2 2p6 3s2 3p6 4s1
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s1
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 6s1
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6 7s1
For which element the second ionization enthalpy (KJ mol-1) is 2633?
Caesium.
For which element the atomic radius is 248?
Rubidium.
What is the melting point of potassium?
370.8
453.5
336.2
312.0
____________________ is the important minerals of calcium.
Gypsum
Anhydrite
Fluorspar
All the above.
What is the atomic mass of lithium?
22.99
132.91.
223
6.94
Alkali earth metals are widely distributed in nature in a combined state as ____________.
Carbonates.
Sulphates.
Silicates.
