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.
$\begin{array}{1 1}Only\; (3) \\ Only \;(4) \\ Both \;(3)\;and\;(4) \\ Both (1)\;and\;(2) \end{array}$
