Answer :
Final answer:
The elements Barium, Germanium, Beryllium, Calcium, and Magnesium should be arranged in order of increasing electronegativity as Barium < Calcium < Magnesium < Beryllium < Germanium. Electronegativity increases across a period and decreases down a group in the periodic table.
Explanation:
To arrange the given elements in order of increasing electronegativity, we need to consider their positions in the periodic table and electronegativity trends. Electronegativity generally increases across a period from left to right and decreases down a group. In the group of elements given (Barium, Germanium, Beryllium, Calcium, Magnesium), Barium is at the bottom of the group and will have the least electronegativity. As we move up the group, the electronegativity increases, so Calcium will be next, followed by Magnesium. Since Beryllium is above Magnesium in the same group, its electronegativity is higher. Finally, Germanium is not an alkaline earth metal; it is a metalloid and typically has a higher electronegativity than metals in the same period. Therefore, the correct order is Barium < Calcium < Magnesium < Beryllium < Germanium, which corresponds to answer choice A.
