Periodic Properties Practice Questions - UCalgary Chemistry Textbook

Chemistry End of Chapter Exercises

Based on their positions in the periodic table, predict which has the smallest atomic radius: Mg, Sr, Si, Cl, I.

Solution

Based on their positions in the periodic table, predict which has the largest atomic radius: Li, Rb, N, F, I.

Based on their positions in the periodic table, predict which has the largest first ionization energy: Mg, Ba, B, O, Te.

Solution

Based on their positions in the periodic table, predict which has the smallest first ionization energy: Li, Cs, N, F, I.

Based on their positions in the periodic table, rank the following atoms in order of increasing first ionization energy: F, Li, N, Rb

Solution

Rb < Li < N < F

Based on their positions in the periodic table, rank the following atoms in order of increasing first ionization energy: Mg, O, S, Si

Atoms of which group in the periodic table have a valence shell electron configuration of ns²np³?

Solution

15 (5A)

Atoms of which group in the periodic table have a valence shell electron configuration of ns²?

Based on their positions in the periodic table, list the following atoms in order of increasing radius: Mg, Ca, Rb, Cs.

Solution

Mg < Ca < Rb < Cs

Based on their positions in the periodic table, list the following atoms in order of increasing radius: Sr, Ca, Si, Cl.

Based on their positions in the periodic table, list the following ions in order of increasing radius: K⁺, Ca²⁺, Al³⁺, Si⁴⁺.

Solution

Si⁴⁺ < Al³⁺ < Ca²⁺ < K⁺

List the following ions in order of increasing radius: Li⁺, Mg²⁺, Br^–, Te^2–.

Which atom and/or ion is (are) isoelectronic with Br⁺: Se²⁺, Se, As^–, Kr, Ga³⁺, Cl^–?

Solution

Se, As⁻

Which of the following atoms and ions is (are) isoelectronic with S²⁺: Si⁴⁺, Cl³⁺, Ar, As³⁺, Si, Al³⁺?

Compare both the numbers of protons and electrons present in each to rank the following ions in order of increasing radius: As^3–, Br^–, K⁺, Mg²⁺.

Solution

Mg²⁺ < K⁺ < Br^– < As^3–

Of the five elements Al, Cl, I, Na, Rb, which has the most exothermic reaction? (E represents an atom.) What name is given to the energy for the reaction? Hint: Note the process depicted does not correspond to electron affinity.)

E^{+} (g) + e^{−} ⟶ E (g)

Of the five elements Sn, Si, Sb, O, Te, which has the most endothermic reaction? (E represents an atom.) What name is given to the energy for the reaction?

E (g) ⟶ E^{+} (g) + e^{-}

Solution

O, IE₁

The ionic radii of the ions S^2–, Cl^–, and K⁺ are 184, 181, 138 pm respectively. Explain why these ions have different sizes even though they contain the same number of electrons.

Which main group atom would be expected to have the lowest second ionization energy?

Solution

Explain why Al is a member of group 13 rather than group 3?