Problem: Identify the electron configuration of the metal ion in Fe(NO3)3.a. [Ar]3d6b. [Ar]4s23d6c. [Ar]4s23d3d. [Ar]4s23d6e. [Ar]3d5 

FREE Expert Solution

Fe(NO3)3 → Fe3+ + NO3-

  • Metal ion: Fe3+


s orbital  can hold a maximum of 2 electrons
p orbitals → can hold a maximum of 6 electrons
d orbitals → can hold a maximum of 10 electrons
f orbitals → can hold a maximum of 14 electrons

Atomic number of Fe = 26  → 26 electrons (neutral element)

  • Electron configuration of Neutral Fe: 1s22s22p63s23p64s23d6
  • Noble gas electron configuration: [Ar]4s23d6
    • nearest noble gas before Fe = Argon (Ar)
  • Charge = +3  → subtract 3 electrons (lost e-) from (outermost shell) highest energy, n  
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Problem Details

Identify the electron configuration of the metal ion in Fe(NO3)3.

a. [Ar]3d6
b. [Ar]4s23d6
c. [Ar]4s23d3
d. [Ar]4s23d6
e. [Ar]3d5


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