Pair of transition elements which show abnormal electronic configuration in the first 3d-series are:
Correct answer: C. Cr and Cu
- A. Cr and Ni
- B. Fe and Ni
- C. Cr and Cu
- D. Cu and Co
Explanation
The correct option is C) Cr and Cu. Both Chromium (Cr) and Copper (Cu) are transition elements that show abnormal electronic configurations in the first 3d-series. Chromium has an electronic configuration of [Ar] 3d^5 4s^1, and Copper has an electronic configuration of [Ar] 3d^10 4s^1.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Electronic Structure of d-Block Elements
The electronic structure of d-block elements covers the filling of the (n-1)d and ns orbitals, general electronic configurations, and the exceptions shown by chromium and copper. It explains how partially filled d orbitals produce variable oxidation states, coloured ions, magnetic behaviour and complex formation, while distinguishing transition elements from elements with completely filled d subshells.
Practise Transition Elements
531 free Transition Elements MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Electronic Structure of d-Block Elements questions
3d-series of transition elements contains elements in the range from:
All the elements of 3d-series show correct electronic configuration EXCEPT:
Which of the following is the correct electronic configuration of gold (atomic number of Au = 79)?
d -block elements are called
Which oxidation is possessed by all the elements of group III B?
1st series of transition elements start from?