1. Tardigrade
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  3. Chemistry
  4. In Mendeleev's periodic table, some pairs of elements do not follow increasing order of atomic weight known as anomalous pair. The correct example of anomalous pair is:

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Q. In Mendeleev's periodic table, some pairs of elements do not follow increasing order of atomic weight known as anomalous pair. The correct example of anomalous pair is:

Classification of Elements and Periodicity in Properties

Solution:

Atomic weight of $Th=232$

Atomic weight of $Pa =231$