1. According to the general trend in electron affinities, which group (or family

Question

1. According to the general trend in electron affinities, which group (or family) of elements tend to form the most stable anions in the gas phase?

A.alkaline earth metals

B.halogens

C.transition metals

D.alkali metals

E.noble gases

2. An unknown element, X, reacts with oxygen to form two oxides with the general formula X2O3 and X2O5. The pure element is strongly paramagnetic, and the oxides are amphoteric. Which of the following elements could be represented by X?

A.Sc

B.S

C.Sb

D.Bi

E.Na

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

A.have relatively low first ionization energies.

B.are in Period 1 of the periodic table.

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

D.have low relative atomic masses.

E.are active metals.

4. Which of the following have one or more filled d subshells in their ground state electron configuration?

A.Al

B.Si

C.Mn

D.Ga

E.Sc

Explanation / Answer

1) B.halogens

2) C.Sb

3) A.have relatively low first ionization energies.

4) C.Mn

    D.Ga

    E.Sc

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