Question

Arrange the following on the basis of increasing melting point-Li, K, Na

Answer 1

Answer:

Lithium, Li 180°C

Sodium, Na 98°C

Potassium, K 63°C

Answer 2

Answer: K < Na < Li

Explanation: melting point decreases down the alkali group because

distance between the bonding electrons and the positive nucleus gets larger and reduces the overall attraction between the two.