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Which of the following statements about the atomic and physical properties of noble-gases are incorrect?

1. Atomic mass, boiling point, and atomic radii INCREASE down group-18 in the periodic table.

2. Down Group 18, atomic radius and interatomic forces INCREASE resulting in an INCREASED melting point, boiling point, enthalpy of vaporization, and solubility.

3. The ionization potential DECREASES with an INCREASING radius down the group

4. The first ionization energy INCREASES down a group in the periodic table.

$\begin{array}{1 1}Only\; (3) \\ Only \;(4) \\ Both \;(3)\;and\;(4) \\ Both (1)\;and\;(2) \end{array}$
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Answer: Only (4)
The first ionization energy DECREASES down the group in the periodic table.All other statements are true.
answered Jul 28, 2014 by balaji.thirumalai

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