Dimitri Mendeleev

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Last updated 4:11 PM on 9/25/25
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6 Terms

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Who was Dimitri Mendeleev?

A Russian Chemist, who published a periodic table containing gaps in 1869

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What was the periodic table arranged in before protons neutrons and electrons were discovered?

Atomic Weight (now known as atomic mass)

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Why was Mendeleev’s periodic table special?

He left gaps for undiscovered elements, and could predict the properties of undiscovered elements

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Why isn’t Mendeleevs table used today?

Some of his atomic masses were wrong due to the existence of isotopes

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What are Isotopes?

Elements with the same number of protons and electrons but a different number of neutrons, therefore, they have different atomic weights

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