Boron has the highest ionisation potential among group IIIA elements.
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The element with the highest ionization energy in Group 3A (Group 13) is usually thallium (Tl), followed by indium (In) and then gallium (Ga). Thallium has the highest ionization energy due to its partially filled d-orbital, which imparts extra stability.
In group 3A elements, or elements in group 13, have only one unpaired electrons.
Thallium
I think that the ionic radii decrease
Boron is located in group 3A. It is group 13 in modern notation. This set of elements have three valence electrons.Boron is in the 13th group in the periodic table. Elements in this group has 3 electrons in the outermost energy level. That means they have 3 valence electrons.
Group 3a (13) on the periodic table contains boron which is considered a metalloid. The other elements in the group are post-transition metals.