1. Tardigrade
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  3. Chemistry
  4. Suppose an orbital may accomodate 3 electrons then the number of elements in IV period.

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Q. Suppose an orbital may accomodate $3$ electrons then the number of elements in $IV$ period.

Classification of Elements and Periodicity in Properties

Solution:

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no. of orbital $=9$
(one orbital occupy $3$ electron)
then no. of elements $=9 \times 3=27$