Q.

Which of the following elements has the lowest melting point?

A. Sodium
B. Tin
C. Radon
D. Radium
Answer» C. Radon
Explanation: Among the given elements, Radon has the lowest melting point of-71°Celsius. The melting point of other elements are as follows: Sodium: 98° C; Tin 232° C; Radium: 700°C
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