Who devised the first version of the periodic table?
Dmitri Ivanovich Mendeleev
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What did Mendeleev discover?
He discovered that if you make a gap in this line then suddenly you have elements with properties in the same group
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What did Mendeleev do when he believed that not all elements had been discovered?
He left gaps when he realised some elements had differentiating properties indicating that they couldn't be in the same group
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Was Mendeleev correct where he left the gaps?
Yes, the periodic table did indeed have missing elements at the time which have now been filled in.
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Why did he leave gaps in the table?
Some element did not share properties with others in their group. Therefore, he realised that there must be undiscovered elements that do share these properties
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Other cards in this set
Card 2
Front
What did Mendeleev discover?
Back
He discovered that if you make a gap in this line then suddenly you have elements with properties in the same group
Card 3
Front
What did Mendeleev do when he believed that not all elements had been discovered?
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