Question

how does the number given just below the symbol for magnesium (rounded to 0.01) compare with average mass (amu) of one magnesium atom
The mass given in the table is for 6.022E23 atoms of Mg.

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When magnesium is heated in air, it reacts with oxygen to form magnesium oxide. 2Mg + O2 --> 2MgO... Naturally occurring magnesium consists of Magnesium-24 (23.9850 amu; 78.99%), Magnesium-25 (24.9858... Magnesium is a chemical element with symbol Mg and atomic number 12. Magnesium only occurs naturall... Naturally occurring magnesium is composed of two isotopes. Magnesium-24 has a mass of 23.9850 amu an...