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Which of the following coordination compounds obey the effective atomicnumber (EAN) rule or the 18-electron rule ?Cr(CO)6; Fe(CO)5; [Cu(CN)4]2-; [Pd(NH3)6]4+; [Fe(CN)6]4-Show how you arrive at your answer

Question

Which of the following coordination compounds obey the effective atomicnumber (EAN) rule or the 18-electron rule ?Cr(CO)6; Fe(CO)5; [Cu(CN)4]2-; [Pd(NH3)6]4+; [Fe(CN)6]4-Show how you arrive at your answer

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Solution 1

To determine which of the coordination compounds obey the effective atomic number (EAN) rule or the 18-electron rule, we need to calculate the total number of electrons in each compound and compare it to the expected number.

  1. Cr(CO)6:
  • Chromium (Cr) has an atomic number of 24.
  • Each carbon monoxide (CO) ligand contributes 2 electrons.
  • Therefore, the total number of electrons in Cr(CO)6 is 24 + (6 * 2) = 36.
  • This compound does not obey the EAN rule or the 18-electron rule since it has more than 18 electrons.
  1. Fe(CO)5:
  • Iron (Fe) has an atomic number of 26.
  • Each carbon monoxide (CO) ligand contributes 2 electrons.
  • Therefore, the total number of electrons in Fe(CO)5 is 26 + (5 * 2) = 36.
  • This compound does not obey the EAN rule or the 18-electron rule since it has more than 18 electrons.
  1. [Cu(CN)4]2-:
  • Copper (Cu) has an atomic number of 29.
  • Each cyanide (CN) ligand contributes 2 electrons.
  • Therefore, the total number of electrons in [Cu(CN)4]2- is 29 + (4 * 2) + 2 = 39.
  • This compound does not obey the EAN rule or the 18-electron rule since it has more than 18 electrons.
  1. [Pd(NH3)6]4+:
  • Palladium (Pd) has an atomic number of 46.
  • Each ammonia (NH3) ligand contributes 2 electrons.
  • Therefore, the total number of electrons in [Pd(NH3)6]4+ is 46 + (6 * 2) - 4 = 60.
  • This compound obeys the EAN rule and the 18-electron rule since it has exactly 18 electrons.
  1. [Fe(CN)6]4-:
  • Iron (Fe) has an atomic number of 26.
  • Each cyanide (CN) ligand contributes 2 electrons.
  • Therefore, the total number of electrons in [Fe(CN)6]4- is 26 + (6 * 2) + 4 = 48.
  • This compound does not obey the EAN rule or the 18-electron rule since it has more than 18 electrons.

In summary, out of the given coordination compounds, only [Pd(NH3)6]4+ obeys the effective atomic number (EAN) rule and the 18-electron rule.

This problem has been solved

Solution 2

To determine which of the coordination compounds obey the effective atomic number (EAN) rule or the 18-electron rule, we need to calculate the total number of electrons in each compound and compare it to the expected number.

  1. Cr(CO)6:
  • Chromium (Cr) has an atomic number of 24.
  • Each carbon monoxide (CO) ligand contributes 2 electrons.
  • Therefore, the total number of electrons in Cr(CO)6 is 24 + (6 * 2) = 36.
  • This does not satisfy the 18-electron rule or the EAN rule.
  1. Fe(CO)5:
  • Iron (Fe) has an atomic number of 26.
  • Each carbon monoxide (CO) ligand contributes 2 electrons.
  • Therefore, the total number of electrons in Fe(CO)5 is 26 + (5 * 2) = 36.
  • This does not satisfy the 18-electron rule or the EAN rule.
  1. [Cu(CN)4]2-:
  • Copper (Cu) has an atomic number of 29.
  • Each cyanide (CN) ligand contributes 2 electrons.
  • Therefore, the total number of electrons in [Cu(CN)4]2- is 29 + (4 * 2) + 2 = 39.
  • This does not satisfy the 18-electron rule or the EAN rule.
  1. [Pd(NH3)6]4+:
  • Palladium (Pd) has an atomic number of 46.
  • Each ammonia (NH3) ligand contributes 2 electrons.
  • Therefore, the total number of electrons in [Pd(NH3)6]4+ is 46 + (6 * 2) - 4 = 60.
  • This satisfies the 18-electron rule and the EAN rule.
  1. [Fe(CN)6]4-:
  • Iron (Fe) has an atomic number of 26.
  • Each cyanide (CN) ligand contributes 2 electrons.
  • Therefore, the total number of electrons in [Fe(CN)6]4- is 26 + (6 * 2) + 4 = 48.
  • This does not satisfy the 18-electron rule or the EAN rule.

Based on the calculations, only [Pd(NH3)6]4+ obeys both the effective atomic number (EAN) rule and the 18-electron rule.

This problem has been solved

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