Quiz on Valence Electrons and Molecular Shapes

What are Lewis structures used for?

• To determine the number of valence electrons in an atom

• To show the arrangement of electrons in a molecule

• To determine the shape of a molecule

• To determine the atomic mass of an element

How do valence electrons determine bonding?

• Valence electrons are transferred between atoms to form ionic bonds

• Valence electrons are shared between atoms to form covalent bonds

• Valence electrons repel each other, causing atoms to bond

• Valence electrons determine the charge of an atom

How many valence electrons does carbon have?

• 1

• 2

• 4

• 6

Which element forms 4 bonds to achieve 8 valence electrons?

• Carbon

• Nitrogen

• Oxygen

• Fluorine

What is the shape of methane (CH₄) molecule?

• Linear

• Trigonal planar

• Tetrahedral

• Octahedral

How many lone pairs of electrons does ammonia (NH₃) have?

• 0

• 1

• 2

• 3

What is the shape of water (H₂O) molecule?

• Linear

• Trigonal planar

• Tetrahedral

• Bent

How many single bonds does oxygen difluoride (OF₂) form?

• 1

• 2

• 3

• 4

How many lone pairs of electrons does each nitrogen atom have in hydrazine (N₂H₄)?

• 0

• 1

• 2

• 3

What is the shape of acetylene (C₂H₂) molecule?

• Linear

• Trigonal planar

• Tetrahedral

• Linear