A certain element is a metalloid that forms an acidic oxide with the formula R2O5. Identify the element.
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Explanation:
The formula R2O5 suggests a period VA element. There are two metalloids in Group VA, arsenic and antimony. That this is an acidic oxide indicates that this metalloid has considerable nonmetal character. So of the two metalloids, the one nearer the top of the column, arsenic, seems most likely.
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I don't no ...................
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