The empirical formula of the metal oxide would be 
<h3>What is empirical formula?</h3>
Mass of scandium = 0.502g
Mass of scandium + oxygen = 0.768g
Mass of oxygen = 0.768 - 0.502 = 0.266g
Mole of scandium = 0.502/44.95 = 0.011
Mole of oxygen = 0.266/16 = 0.017
Divide by the lowest:
Scandium = 0.011/0.011 = 1
Oxygen = 0.017.0.011 = 1.5
Thus, the empirical formula of the compound would be
or 
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Answer:
CO2
Explanation:
All of the other options are elements found on the periodic table but Carbon Dioxide are two elements.
First look for the atomic number and that is the electron for barium
Answer:
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Explanation: