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2 fixed grammatical errors to clarify question.
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How did chemists foundfind how many electronelectrons, neutronneutrons, protonand protons each element had?

I mean I can understand the Mendeleev's table but without really knowing how you make one...

How chemists found how many electron, neutron, proton each element had?

I mean I can understand the Mendeleev's table but without really knowing how you make one...

How did chemists find how many electrons, neutrons, and protons each element had?

I mean I can understand the Mendeleev's table but without really knowing how you make one...

1
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How chemists find out the electronic properties of elements (atomic numbers)

How chemists found how many electron, neutron, proton each element had?

I mean I can understand the Mendeleev's table but without really knowing how you make one...