Worksheet: Molecular Orbital Diagrams of Diatomics

In this worksheet, we will practice comparing the energies and arrangement of molecular orbitals in diatomics and identifying the effects of sā€“p mixing.

Q1:

Which of the following is a consequence of s-p mixing?

  • AThe first ionization of N 2 produces a paramagnetic ion.
  • BThe fourth ionization of O 2 produces a paramagnetic ion.
  • CThe first ionization of C 2 produces a paramagnetic ion.
  • DThe second ionization of N 2 produces a diamagnetic ion.
  • EThe second ionization of O 2 produces a diamagnetic ion.

Q2:

Which of the following statements is true?

  • AThe F 2 + 2 ion is diamagnetic.
  • BIt is not possible for the orbitals in a subshell to form molecular orbitals if the subshell is empty.
  • CThe order of the šœŽ 3 p and šœ‹ 2 p orbitals in a C l 2 molecule is reversed due to s-p mixing.
  • DThe F 2 + 2 ion has a bond order of 2.
  • EThe effect of s-p mixing increases with atomic number across a period.

Q3:

In which of the following molecules is the šœŽ 2 s orbital lowest in energy?

  • A C 2
  • B B 2
  • C N 2
  • D F 2
  • E O 2

Q4:

Which of the following molecules or ions is diamagnetic?

  • A O 2 +
  • B B 2
  • C F 2 ā€“
  • D C 2 2 ā€“
  • E O 2

Q5:

For which of these elements does the formation of a neutral homonuclear diatomic molecule decrease the first ionization energy?

  • A N
  • B H
  • C C
  • D O
  • E B

Q6:

In which of these molecules does the first ionization result in the removal of a šœŽ electron?

  • A C 2
  • B B 2
  • C O 2
  • D N 2
  • E F 2

Q7:

Which of the following ions has the highest bond order?

  • A B e 2 2 ā€“
  • B L i 2 2 ā€“
  • C B 2 2 ā€“
  • D C 2 2 ā€“
  • E N 2 2 ā€“

Q8:

Which of the following ions has the highest bond order?

  • A P 2 2 +
  • B A l 2 2 +
  • C A r 2 2 +
  • D S 2 2 +
  • E N a 2 2 +

Q9:

What is the bond order of B e 2 + ?

Q10:

What is the bond order of O 2 2 ā€“ ?

  • A0.5
  • B0
  • C1.5
  • D1
  • E2

Q11:

In the MO diagram of a heteronuclear diatomic molecule, which of the following is an accurate description of the relative energies of the atomic orbitals?

  • AThe atomic orbitals are drawn at the same energy to indicate allowed symmetry.
  • BThe atomic orbitals are drawn at the same energy to indicate bond formation.
  • CThe orbital of the atom with the smallest radius is drawn at the lowest energy.
  • DThe orbital of the atom with the highest electronegativity is drawn at the lowest energy.
  • EThe orbital of the atom with the highest number of electron lone pairs is drawn at the lowest energy.

Q12:

H 2 and H e 2 both have completely filled bonding molecular orbitals. Why does helium gas consist of separate atoms while hydrogen gas is diatomic?

  • AHelium is a noble gas and never forms bonds.
  • B H e 2 also has electrons in non-bonding orbitals, resulting in a bond order of zero.
  • C H 2 also has electrons in nonbonding orbitals, resulting in a bond order of two.
  • D H e 2 also has electrons in antibonding orbitals, resulting in a bond order of zero.
  • E H 2 has no antibonding orbitals, resulting in a bond order of two.

Q13:

Calculate, to 1 decimal place, the bond order of the diatomic ion with the electronic configuration: ( šœŽ ) ( šœŽ ) ļ€ŗ šœ‹ , šœ‹ ļ† ļ€ŗ šœ‹ , šœ‹ ļ† . ļŠØ ļ ļŠØ āˆ— ļŠØ ļ ļŠØ ļŠØ ļŒ ļŠØ ļŒ ļŠ© āˆ— ļŠØ ļŒ āˆ— ļŠØ ļŒ ļŠ§ ļ‘‘ ļ‘’ ļ‘‘ ļ‘’

Q14:

Calculate, to 1 decimal place, the bond order of a diatomic molecule with the electronic configuration ( šœŽ ) ( šœŽ ) ļ€¹ šœŽ ļ… ļ€ŗ šœ‹ , šœ‹ ļ† 2 š‘  2 āˆ— 2 š‘  2 2 š‘ 2 2 š‘ 2 š‘ 2 š‘„ š‘¦ š‘§ .

Q15:

Calculate, to 1 decimal place, the bond order of the diatomic ion with the electronic configuration .

Q16:

What is the bond order for the B e 2 molecule?

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