If an element forms an oxide$A_2{O}_3$which is acidic in nature, then A will be _________.

If an element forms an oxide $A_2{O}_3$, which is acidic in nature then A will be non-metal.
From the given statement, we know that the oxide of the element is acidic in nature, then A will be considered a non-metal because the acidity of non-metal oxides is generally measured in terms of the acidic solutions generated when they react with water. So, $A$ is a non-metal in the given compound.