Question

the atomic mass of magnesium from the periodic table is 24.31 amu. what does this mass represent? a the atomic mass of the most abundant isotope of magnesium b the weighted average of the two most abundant isotopes of magnesium c the weighted average of all of the naturally occurring isotopes of magnesium d the arithmetic average of the two most abundant isotopes of magnesium

Explanation:

The atomic mass listed on the periodic table for an element is calculated as the weighted - average of the masses of all of its naturally - occurring isotopes, taking into account their relative abundances.

Answer:

C. the weighted average of all of the naturally occurring isotopes of magnesium