Test 3

Which of the following groups contain three elements with stable electron configurations?

• lithium, krypton, argon

• argon, neon, barium

• xenon, neon, boron

• helium, xenon, neon

Typically, atoms gain or lose electrons to achieve

• an exchange of energy.

• ionization.

• a stable electron configuration.

• vaporization.

In an electron dot diagram, the symbol for an element is used to represent

• the nucleus.

• the nucleus and all electrons.

• the nucleus and valence electrons.

• the nucleus and all non-valence electrons.

Ionization energies tend to

• decrease from left to right across a period.

• increase from the top of a group to the bottom.

• increase from left to right across a period.

• decrease from the bottom of a group to the top.

The formation of an ionic bond involves the

• transfer of electrons.

• transfer of neutrons.

• transfer of protons.

• sharing of electrons.

Which of the following statements correctly describes the substance with the formula KI?

• Molecules of potassium iodide contain one atom of potassium and one atom of iodine.

• There is a one-to-one ratio of potassium ions to iodide ions.

• Potassium iodide is a molecular compound.

• Potassium iodide is a polyatomic ion.

Which statement best describes the properties of sodium chloride?

• Sodium chloride is a malleable solid.

• Solid sodium chloride is a good conductor of electric current.

• Sodium chloride has a low melting point.

• Liquid sodium chloride is a good conductor of electric current.

Which of the following is a typical property of an ionic compound?

• low melting point

• poor conductor of electric current when melted

• tendency to shatter when struck

• all of the above

When two atoms of the same nonmetal react, they often form a(an)

• ionic bond.

• polyatomic ion.

• diatomic molecule.

• polar molecule.

You see a structural formula in which the symbols for elements are connected by a long dash. You can assume that the chemical bonds in the compound are

• ionic.

• covalent.

• metallic.

• unstable.