Chemistry · Periodic Properties
Which of the following statements correctly describes the trend and primary reason for the variation in first ionization energy (IE1) from Cr to Mn to Fe in the 3d transition series?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Fe has a lower IE1 than Mn due to electron pairing in the 3d orbitals.
- 2Cr has the highest IE1 because of its stable 3d54s1 configuration.
- 3IE1 decreases from Cr to Mn to Fe due to an increase in atomic radius.
- 4IE1 increases from Cr to Mn to Fe primarily due to increasing effective nuclear charge (Zeff).✓
Correct answer
IE1 increases from Cr to Mn to Fe primarily due to increasing effective nuclear charge (Zeff).
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