chapter 3 - lesson 4

Which of the following best describes the electron-sea model of metals?

• Metals consist of closely packed positive ions surrounded by a sea of electrons forming a giant structure.

• Metals consist of loosely packed positive ions surrounded by a sea of electrons forming a giant structure.

• Metals consist of loosely packed negative ions surrounded by a sea of cations forming a giant structure.

Which of the following, at room temperature and pressure, is an example of a metallic solid?

• Iron

• Carbon

• Phosphorus

Which of the following elements is defined as a metal according to the given electron-sea model?

• Aluminium

• Magnesium

• Potassium

Which of the following statements is valid when comparing the electrical conductivity of copper to that of lithium?

• Lithium has higher electrical conductivity its electrons are more free to move.

• Copper has higher electrical conductivity because its electrons are more free to move.

• Lithium has higher electrical conductivity its neutrons are more free to move.

Which of the following trends do iron and chromium share?

• Loosely packed, positive ions that form a lattice structure

• Closely packed, positive ions that form a lattice structure

• Closely packed, negative ions that form a lattice structure

Which of the following diagrams best represents metallic bonding?

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Shown in the bar chart are the electrical conductivities of aluminum, magnesium, and sodium.

Using the symbols of the elements, identify the metals X , Y and Z

• X = Al , Y = Mg , Z = Na

• Y = Al , Z = Mg , X = Na

• Z = Al , X = Mg , Y = Na

Which of the following is the best definition for the term “nondirectional”?

• Each valence electron of an atom is shared equally with one neighboring atom.

• Each valence electron of an atom is shared equally with all neighboring atoms.

• Bonds involve uniform electrostatic attraction between spherical nuclei.

Which of the following has the smallest effect on the strength of a metallic bond?

• The number of electrons in the metal atoms

• The number of neutrons in the metal atoms

• The arrangement of the metal atoms

Which of the following atoms would form a solid metal with the lowest thermal conductivity?

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