What Do the Numbers on the Periodic Table Mean?
The atomic number tells you how many protons an element has, while the atomic mass is the average weight of the element's atoms. Super handy for chem exams!
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The numbers on the periodic table mainly stand for the atomic number and the atomic mass. The atomic number (the whole number) tells you the number of protons in the nucleus, while the atomic mass (the decimal number) averages the mass of protons and neutrons in the atom.
Just memorize this: Atomic number = protons. Atomic mass = protons + neutrons. Trust me, it makes everything easier.
Atomic number equals the number of protons. That's all you really need to know for starters.
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