Development of the Periodic Table

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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