Ununoctium.
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The element Ununoctium, Uuo, has an atomic mass of 293.
The average atomic mass of an element is the average of the atomic masses of its isotopes (that is a weighted average). You have to take into account the abundance of each isotope when they do your averaging.
Magnesium is a meta element. Atomic mass of it is 24.
Chlorine is a non meta element. Atomic mass of it is 35.
Copper is a meta element. Atomic mass of it is 64.