Alkali earth metals are widely distributed in nature in a combined state as ____________.
Carbonates.
Sulphates.
Silicates.
All the above.
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
What is the first ionization enthalpy (KJ mol-1) of caesium?
496
520
376
419
What is the electronic configuration of potassium?
1s2 2s1
1s2 2s2 2p6 3s2 3p6 4s1
The distortion of the electron cloud of an anion by a cation is called _________________.
Photoelectric effect.
Photoelectrons.
Polarisation.
None of the above.
For which element the density (g cm-3) (at 293 k) is 1.53?
Lithium
Sodium
Potassium
Rubidium
What is the M - H bond energy (kJ mol-1) of PH3?
391
322
247
255
What is the melting point of potassium?
370.8
453.5
336.2
312.0
What is the ionic radius of Potassium?
102
138
152
167
What is the boiling point of sodium?
1154.4
1620
1038.5
978.0
