The number of d-electrons in Fe2+ (atomi

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Target Exam

CUET

Subject

Chemistry

Chapter

Inorganic: D and F Block Elements

Question:

The number of d-electrons in Fe²⁺ (atomic number = 26) is not equal to which of the following?

Options:

p-electrons in neon (atomic number = 10)

p-electrons in Na⁺ ion (atomic number = 11)

s-electrons in Mg (atomic number = 12)

p electrons in Cl^- (atomic number of Cl = 17)

Correct Answer:

s-electrons in Mg (atomic number = 12)

Explanation:

₂₆Fe : [Ar]4s²3d⁶ ; Fe2+ : [Ar]3d⁶

₁₀Ne : 1s²2s²2p⁶

₁₁Na : 1s²2s²2p⁶3s¹ ; Na+ : 1s²2s²2p⁶

₁₂Mg : 1s²2s²2p⁶3s²

₁₇Cl : 1s²2s²2p⁶3s²3p⁵ ; Cl- : 1s²2s²2p⁶3s²3p⁶

s-electrons in Mg is not equal to that of d-electrons in Fe²⁺.