An element has the neutral ground state electronic configuration . To which group of the modern peri — Periodic Table and Periodicity Chemistry Question
Question
An element has the neutral ground state electronic configuration $1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2 4p^6 4d^{10} 5s^2 5p^3$. To which group of the modern periodic table does it belong?
Answer: C
💡 Solution & Explanation
The outermost shell is the 5th shell ($n=5$), and the differentiating electron enters the p-subshell. Therefore, it is a p-block element. For p-block elements, the Group Number = $12 + \text{number of valence p-electrons} = 12 + 3 = 15$. Alternatively, $10 + \text{valence s and p electrons} = 10 + 2 + 3 = 15$. It belongs to the Nitrogen family.
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