Write the atomic number of the element ...

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

Question : 6 of 40

Marks: +1, -0

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

Solution:

\,{}_{17}\mathrm{Cl}

→ It belongs to the third period. So, outermost shell is n = 3. Its configuration is [Ne]

3s^{2}\,3p^{5}

Therefore, its atomic number = 17.

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