Which of the following is a property of Group 18 elements?
High electronegativity
Low boiling point
High melting point
High reactivity
Group 18 elements are gases at room temperature and pressure and have very low boiling points because of their complete outermost shell of electrons, which makes them very stable and unreactive. Hence option B is the correct answer.
Option (A) is incorrect because Group 18 elements have low electronegativity due to their stable electron configuration. Hence option A is incorrect.
Option (C) is incorrect because Group 18 elements have very low melting points and are gases at room temperature and pressure.Hence option C is incorrect.
Option (D) is incorrect because Group 18 elements are very unreactive and inert. Hence option D is incorrect.