The elements found in group 2a, from top to bottom, include beryllium, magnesium, calcium, strontium, and barium. which of these elements has the highest electronegativity value?

Answer is beryllium.

The electronegativity trend is that it increases from left to right in a period and from bottom to top in a group. This is why fluorine has the highest electronegativity out of all the elements. So since beryllium is at the very top of the group, it has the highest electronegativity