Multiple choice

What did Mendeleev do which made his table so important?

  1. He discovered 63 new elements

  2. He left gaps to be filled in later

  3. He put it in atomic order for the first time

  4. He made it colourful
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Mendeleev's genius was leaving gaps in his table for elements that had not yet been discovered. He correctly predicted the properties of these missing elements based on the patterns of the table.

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