Question

Which of the following alkali metal posses higher boiling and melting point?

• A. $Li$
• B. $Rb$
• C. $Na$
• D. $K$

Answer 1

The correct option is A $Li$

All alkali metals are soft and they can be easily cut through a knife except $Li$. $Li$ is hard due to its anamolous behaviour. This is due to its exceptional smaller size and higher polarising power. Since, $Li$ is harder than $Na,K$ and $Rb$ it has the higher boiling and melting point.