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What is the significance of the number that is written above each of the atomic symbol in the periodic table?

What is the significance of the number that is written above each of the atomic symbol in the periodic table?
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what is the significance of the number that is written above each of the atomic symbol in the periodic table?

User Thkang
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It is the atomic number of the element, which is the number of protons in the nucleus of an atom that determines the chemical properties of an element.
User Eric MJ
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