Atomic Structure Result Question 34
34. The correct ground state electronic configuration of chromium atom is
(1989, 1M)
(a) $[\mathrm{Ar}] 3 d^5 4 s^1$
(b) $[\mathrm{Ar}] 3 d^4 4 s^2$
(c) $[\mathrm{Ar}] 3 d^6 4 s^0$
(d) $[\mathrm{Ar}] 4 d^5 4 s^1$
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Answer:
Correct Answer: 34. ( a )
Solution:
- $\mathrm{Cr}(24)=\underbrace{1 s^2 2 s^2 2 p^6 3 s^2 3 p^6}_{\mathrm{Ar}} 3 d^5 4 s^1$
The above configuration is exception to Aufbau’s principle.
BETA
