1. Tardigrade
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  3. Chemistry
  4. The electronic configuration of an element is 1s2,2s2 2p6,3s2 3p3. What is the atomic number of the element, which is present just below the above element in the periodic table?

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Q. The electronic configuration of an element is $1s^2,2s^2 2p^6,3s^2 3p^3$. What is the atomic number of the element, which is present just below the above element in the periodic table?

AIPMTAIPMT 1995Classification of Elements and Periodicity in Properties

Solution:

The element which present just below this element will have outermost electronic configuration as $4s^2 4p^3$, so its full electronic configuration is $1s^2, 2s^2 2p^6, 3s^2 3p^6, 4s^2,$ $3d^{10}, 4p^3$ and hence, its atomic number is 33.