Ok pls wait my brain is Loading.......
Explanation:
In any chemical change, one or more initial substances change into a different substance or substances. ... According to the law of conservation of matter, matter is neither created nor destroyed, so we must have the same number and kind of atoms after the chemical change as were present before the chemical change
Example:
The carbon atom in coal becomes carbon dioxide when it is burned. The carbon atom changes from a solid structure to a gas but its mass does not change.
The answer is 2BaO + O2 -> 2BaO2
It does not support her conclusion, because anything that forms an ionic bond with beryllium would not be a metal, and all group 2 elements are metals.
Hope this helps!