An element has the general outer electronic configuration , where the highest principal quantum numb — Periodic Table and Periodicity Chemistry Question
Question
An element has the general outer electronic configuration $(n-1)d^5 ns^1$, where the highest principal quantum number $n = 4$. To which specific IUPAC group number (from 1 to 18) does this element belong in the modern periodic table?
Answer: 6
💡 Solution & Explanation
Substituting $n=4$ yields the configuration $3d^5 4s^1$, which is the half-filled anomalous configuration of Chromium ($Cr$). For d-block elements, the group number is calculated as the sum of $(n-1)d$ electrons and $ns$ electrons. Group number = $5 + 1 = 6$.
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