Question

1.

Sodium and potassium have similar chemical and physical properties. This is best explained by the fact that both elements

A.have low relative atomic masses.

B.are in Period 1 of the periodic table.

C.have relatively low first ionization energies.

D.have the same ground-state valence-electron configuration.

E.are active metals.

2.

Which of the following statements is true concerning the electron configuration [Ne]3s¹3p¹?

A.It may represent a ground-state electron configuration of a Al⁺ cation.

B.It may represent an excited-state electron configuration of a Mg atom.

C.It may represent an excited-state electron configuration of a Ne^– anion.

D.It may represent a ground-state electron configuration of a Na⁺ cation.

E.It may represent a ground-state electron configuration of a Mg⁺ cation.

3.

Which of the following subshells does not exist?

A.3p

B.3f

C.6g

D.4d

E.2s

4.

Sodium oxide reacts with water to produce sodium hydroxide. Suppose 10.2 g of sodium oxide is combined with 34.6 g of water. When the reaction is complete, all the sodium oxide has been consumed. According to the law of conservation of mass, which is a true statement?

A.The mass of sodium hydroxide produced plus the mass of unreacted water must equal 44.8 g.

B.The mass of sodium hydroxide produced must equal 10.2 g.

C.The mass of water consumed must equal 10.2 g.

D.The mass of sodium hydroxide produced must equal 44.8 g.

E.The mass of unreacted water must equal 24.4 g.