Development of the Periodic Table
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Last updated 6:37 PM on 6/3/24
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4 Terms
1
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how were elements classified before the discovery of subatomic particles?
they were arranged in order of atomic weight
2
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what were the problems with categorising elements by atomic weight
the tables were incomplete
elements would be placed in inappropriate groups
3
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How did Mendeleev overcome the problems with this periodic table?
he left gaps for the elements that he thought hadn’t been discovered
he changed the order based on atomic weight in some areas
4
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why wasn’t order based on atomic weight always correct?
the existence of isotopes
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Flashcards (44)