🤓 Based on our data, we think this question is relevant for Professor Sumner's class at UF.
We are being asked to rank the given group 2A elements from strongest to weakest reducing agent. A reducing agent is the species that are being oxidized in a redox reaction. Recall the mnemonics LEO GER.
The strongest reducing agent would be the element that would be easily oxidized or easily loses an electron. The ease to remove an electron from an element is related to their atomic size.
Predict the relative reducing power of the group 2A elements. Rank from strongest to weakest reducing agent. To rank items as equivalent, overlap them.
Ca, Mg, Be, Sr, Ba