The properties that increase down a column in the periodic table is
Ionic radii
Explanation
In periodic table column is also referred to as group.
Ionic radii tend to increase as you move from top to bottom of the group. This is because down the group there is increase of extra shell which increases the distance from the nucleus to outer shell.
The ionization energy and effective nuclear charge decreases down the group while number of valence shell electrons remain the same.
By definition, the correct answer is second option: ionic radius increase down a column in the periodic table.
Ionic radius is defined in relation to ions. An ion is a chemical species with a charge, either positive or negative.
So, the ionic radius is the distance between the center of the nucleus of the atom and the most distant stable electron from it.
In summary, the ionic radius refers to the radius that an atom has that has gained or lost electrons.
Remembering that the atomic radius is the distance from the atomic nucleus to the outermost stable electron of a neutral atom, descending in a group (column) of the periodic table also increases the effective nuclear charge, but the number of electrons added with respect to the previous item the same group increases by a full layer.
The effect of adding new electronic shells is predominant, causing them to move further away from the atomic nucleus and the atomic radius to increase when we go down in a group.
The ionic radius has the same tendency as the atomic radius and increases as you descend in a group.
Finally, the correct answer is second option: ionic radius increase down a column in the periodic table.
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