Multiple choice

Why some gaps are seen in Mendeleev's periodic table?

  1. He predicted the existence of some elements and space was left for them.

  2. It showed gaps between the atomic weight of elements in a continuous manner.

  3. Space was left for isotopes and nobel gases.

  4. None of these
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A Correct answer
Explanation

It is correct because Mendeleev was able to predict the existence and even properties of some elements and so he left space for them in the periodic table.

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