Dimitri Mendeleev
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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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