Answer:
the answer is B =the weighted average of the masses of the isotopes of the element
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1p is not possible because it goes like this 1s2 2s2 2p6
Answer:
d
. Sc2O5
Explanation:
Hello,
In this case, when forming oxides from a metal and oxygen, for us to find out each element's subscript, we must exchange them as shown below, considering +5 for scandium:

For that reason, the answer is d
. Sc2O5
Best regards.