(a)What property do all elements in the same column of the Periodic Table as boron have in common ?
(b) What property do all elements in the same column of the Periodic Table . as fluorine have in common ?

(a) The property that all the elements in the same column of the periodic table as boron have is: “the same number of valence electrons (3). Hence, they all have valency equal to 3.”
(b)
All elements in the same column of the Periodic Table as fluorine have in common seven electrons in their valence shell and they all are belong to group thirteen.