Worksheet: Electron Pair and Molecular Geometries

In this worksheet, we will practice classifying the bond and electron pair arrangements and identifying the ideal angles of common molecular geometries.

Q1:

Nitrogen and phosphorus atoms can both form bonds with three fluorine atoms. However, only phosphorus atoms can form bonds with five fluorine atoms.

Which term best describes the bonding geometry in NF3 and PF3?

  • ABent
  • BT-shaped
  • CTetrahedral
  • DTrigonal pyramidal
  • ETrigonal bipyramidal

Which term best describes the bonding geometry in PF5?

  • ATrigonal bipyramidal
  • BTetrahedral
  • COctahedral
  • DSquare pyramidal
  • EPentagonal planar

Why is it not possible for NF5 to form?

  • AOnly the P atom possesses valence d orbitals.
  • BThere is insufficient space around the N atom for five NF bonds to form.
  • CThe high electronegativity of the N atom prevents sharing of electron density in five NF bonds.
  • DThe lone pair in NF3 is more stable than two additional NF bonds.
  • EOnly the P atom contains d electrons in its valence shell.

Q2:

The bonding geometry is the same in all but one of the following molecules. In which molecule is the geometry different?

  • A N O 2
  • B S O 2
  • C B e H 2
  • D C O 2
  • E H C N

Q3:

The bonding geometry is the same in all but one of the following molecules and ions. In which species is the geometry different?

  • A [ C o C l ] 4 2
  • B N H 4 +
  • C C C l 4
  • D [ P t C l ] 4 2
  • E P O 4 3

Q4:

What is the geometry of the [PtF]42 complex, and how many unpaired electrons does it contain?

  • ATetrahedral, no unpaired electrons
  • BOctahedral, two unpaired electrons
  • CSquare planar, no unpaired electrons
  • DSquare planar, two unpaired electrons
  • ETetrahedral, two unpaired electrons

Q5:

Which of the following has a T-shaped molecular geometry?

  • A S b F 5
  • B C l F 3
  • C P F 6
  • D I F 5
  • E B F 3

Q6:

What is the molecular geometry of BCl3?

  • ATetrahedral
  • BTrigonal pyramidal
  • COctahedral
  • DTrigonal planar
  • ESquare planar

Q7:

Consider the Lewis structure of water shown.

H O H

What is the electron pair geometry?

  • ASquare planar
  • BTetrahedral
  • CBent
  • DTrigonal planar
  • ETrigonal pyramidal

What is the molecular geometry?

  • ATrigonal pyramidal
  • BBent
  • CTetrahedral
  • DSquare planar
  • ELinear

Q8:

Sulfur tetrafluoride, SF4, is extremely valuable for the preparation of fluorine-containing compounds used as herbicides (i.e., SF4 is used as a fluorinating agent).

What is its electron pair geometry?

  • ATetrahedral
  • BSquare pyramidal
  • CSquare planar
  • DOctahedral
  • ETrigonal bipyramidal

What is its molecular geometry?

  • AOctahedral
  • BTrigonal bipyramidal
  • CSquare planar
  • DTetrahedral
  • ESeesaw

Q9:

What is the electron pair geometry of SF6?

  • AIcosahedral
  • BOctahedral
  • CSquare pyramidal
  • DHexagonal planar
  • ESquare bipyramidal

What is the electron pair geometry of PCl5?

  • ATrigonal bipyramidal
  • BOctahedral
  • CPentagonal planar
  • DSquare pyramidal
  • ETetrahedral

What is the electron pair geometry of BeH2?

  • ABent
  • B 9 0
  • CTrigonal
  • DLinear
  • ETetrahedral

What is the electron pair geometry of CH3+?

  • AT-shaped
  • BTrigonal planar
  • CBent
  • DTrigonal pyramidal
  • ETetrahedral

Q10:

What is the difference between electron pair geometry and molecular geometry?

  • AMolecular geometry is concerned with the rough shape of the entire molecule, while electron pair geometry is concerned with the geometry around a single atom.
  • BElectron pair geometry accounts for outer-shell electrons as well as atoms, while molecular geometry is concerned with inner-shell electrons.
  • CElectron pair geometry accounts for lone pairs as well as atoms, while molecular geometry is concerned only with the atoms.
  • DElectron pair geometry accounts for inner-shell electrons as well as outer-shell electrons, while molecular geometry is concerned only with the atoms.
  • EMolecular geometry accounts for lone pairs as well as atoms, while electron pair geometry is concerned only with the atoms.

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