For which element the boiling point is 978.0?
Caesium
Sodium
Potassium
Rubidium
For which element the boiling point is 961.0?
Lithium
What is the boiling point of potassium?
1154.4
1620
1038.5
978.0
For which element the atomic number is 19?
What is the boiling point of sodium?
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
What is the melting point of sodium?
370.8
453.5
336.2.
312.0.
Which one of the following is important ore of the sodium?
Sylvine
Carnalite.
Chile salt petre.
Felspar
For which element the atomic radius is 265?
Caesium.
What is the M - H bond energy (kJ mol-1) of PH3?
391
322
247
255