The electronic configuration of the Fe2+ ion, given that iron has atomic number 26, is
Correct answer: B. [Ar] 3d6
- A. [Ar] 3d4 4s2
- B. [Ar] 3d6
- C. [Ar] 3d5 4s1
- D. [Ar] 3d8
Explanation
Neutral iron is [Ar] 3d6 4s2, and forming the two plus ion removes both 4s electrons because 4s lies above 3d once the d subshell is occupied, leaving 3d6. Removing d electrons instead and writing 3d4 4s2 is the classic mistake. Losing one further 3d electron gives the more stable half filled 3d5 arrangement of Fe3+.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
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
The highest oxidation state shown by manganese is
Which ion would be expected to be colourless in aqueous solution?
Iron is used as a catalyst in the Haber process, and this catalytic ability of transition metals is largely due to
Transition metals have higher melting points and densities than group I metals because
Zinc is not regarded as a true transition element because
Acidified potassium permanganate acts as a strong oxidising agent and in doing so the purple manganate seven ion is reduced to