NCERT Class XI Chemistry Classification of Elements and Periodicity in Properties Solutions

Question : 6

Total: 40

Write the atomic number of the element present in the third period and seventeenth group of the periodic table.

Solution:

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Cl → It belongs to the third period. So, outermost shell is n = 3. Its configuration is [Ne] 3s23p5.
Therefore, its atomic number = 17.

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