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A binary compound of oxygen and an unknown element, X, has the formula XO2 and is...

A binary compound of oxygen and an unknown element, X, has the formula XO2 and is 72.71 mass % oxygen.

(a) What is the atomic weight of element X?  u
(b) What is the symbol for the element on the periodic table? X =
(c) Is the element X a metal or not? _________?
(d) Is the compound XO2 likely to be ionic or covalent?_________ioniccovalent
(e) What is the name of the compound?

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