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What does the bottom number within each box of the periodic table refer to? How can it be used to determine the number of neutrons inside an element?

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Answer:

Atomic Number

Explanation:

The number below the symbol is the atomic number and this reflects the number of protons in the nucleus of each element's atom. Every element has a unique atomic number.

mia24682468
Atomic mass
It refers to how many protons and neutrons there are in an element

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