JEE Main 2003 — D And F Block Elements Question with Solution
From: AIEEE 2003
Question
The number of d-electrons retained in Fe2+ (At no of Fe = 26) ion is :
Choose an option
Show full solutionCorrect option: C
Correct answer
C6
Step-by-step explanation
Fe (Z = 26) e- = 26
Fe2+ (Z = 26) e- = 24
Electronic configuration:
Fe (Z = 26) 1s2 2s2 2p6 3s2 3p6 3d6 4s2
Fe2+ (Z = 26) 1s2 2s2 2p6 3s2 3p6 3d6 4s0
as 4s is the outermost shell of Fe that's why e- will always removed first from 4s, so retained e- in d-shell is 6
Fe2+ (Z = 26) e- = 24
Electronic configuration:
Fe (Z = 26) 1s2 2s2 2p6 3s2 3p6 3d6 4s2
Fe2+ (Z = 26) 1s2 2s2 2p6 3s2 3p6 3d6 4s0
as 4s is the outermost shell of Fe that's why e- will always removed first from 4s, so retained e- in d-shell is 6
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