Question : Which of the following elements has the lowest melting point?
Option 1: Sodium
Option 2: Tin
Option 3: Radon
Option 4: Radium
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Correct Answer: Radon
Solution : The correct option is Radon
Radon is a noble gas with a monatomic structure. It has a lower melting point than sodium, radium, and tin. Unlike molecules composed of several atoms, noble gases like radon are single atoms (monatomic). As a result, interatomic forces such as the Van der Waals force, which holds noble gas atoms together in a solid state, become weaker.
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