Which element from group two forms a peroxide instead of an oxide when reacted with oxygen?
A) Beryllium
B) Magnesium
C) Calcium
D) Strontium
E) Barium

Question

Quizplus · Accepted Answer

Barium, being at the bottom of Group 2 in the periodic table, has a larger atomic size and lower ionization energy compared to the other elements listed. This allows it to form peroxides (BaO2) more readily than oxides when reacting with oxygen, due to its ability to stabilize the larger peroxide anion.

Which Element from Group Two Forms a Peroxide Instead of an Oxide