Final answer:
Among Lithium, Magnesium, Bromine, and Xenon, Bromine, being a non-metal, is most likely to form an acidic oxide. Metals like Lithium and Magnesium typically form basic oxides, while Xenon, a noble gas, does not readily form compounds.
Step-by-step explanation:
In determining the element likely to form an acidic oxide among Lithium, Magnesium, Bromine, and Xenon, we need to consider the properties of these elements and their reactivity with oxygen. An acidic oxide or acid anhydride is an oxide that reacts with water to form an acid, or with a base to form a salt. Metals form basic oxides, whereas non-metals form acidic oxides.
Considering the four elements you mentioned, Bromine being a non-metal is most likely to form an acidic oxide. Its oxide, Bromine pentoxide (Br2O5), reacts with water forming Bromic acid (HBrO3).
Lithium and Magnesium, being metals, typically form basic oxides. Xenon, being a noble gas, under normal conditions, does not readily form compounds, including oxides. However, under harsh conditions, Xenon can form Xenon hexafluoride (XeO3) which is an example of a Xenon oxide, and it is actually acidic, which is an exception to the general rule.
Learn more about Acidic Oxide