Question

Periodic table meanings what do numbers mean
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Answer 1

The number is the "atomic number", this reflects the number of protons in the nucleus of each element's atom. The "atomic mass" of an element is the average mass of the atoms of an element measured in atomic mass unit. The atomic mass is a weighted average of all of the isotopes of that element, in which the mass of each isotope is multiplied by the abundance of that particular isotope.

Step-by-step explanation:

Answer 2

the numbers represent the mass or atomic number