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Modern Periodic Table — Chemistry STD 11 Science — Question

Maharashtra BoardEnglish MediumSTD 11 ScienceChemistryModern Periodic Table1 Mark
Question
Write the outer electronic configuration of the following using orbital notation method.
 Cu (belongs to period 4 and group 11)
✓

Answer

a. Cu belongs to period 4. Therefore, $n =4$.
b. Group 11 indicates that the element belongs to the d-block of the modem periodic table.
c. The general outer electronic configuration of the d-block elements is $n s^{0-2}(n-1) d ^{1-10}$.
d. The expected configuration of Cu is $4 s^2 3 d^9$. However, the observed configuration of Cu is $4 s^1 3 d^{10}$. This is due to the extra stability associated with completely filled d-subshell. Thus, the outer electronic configuration of Cu is $4 s^1 3 d^{10}$.

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