
(a)
Interpretation: The expected charges on the ions of elements of the given group should be found.
Concept Introduction: The charges on the ions depend on the valency and electronegativity of the respective element. The magnitude of the ionic charge is equal to its valency. The elements having greater electronegativity show a negative charge while those with lower electronegativity show a positive charge.
(a)

Answer to Problem 57A
The ions of Group 6A have an ionic charge of -2.
Explanation of Solution
Group 6A is the oxygen family, which has a valency of 2. Since they are electronegative elements they form divalent anions.
(b)
Interpretation: The expected charges on the ions of elements of the given group should be found.
Concept Introduction: The charges on the ions depend on the valency and electronegativity of the respective element. The magnitude of the ionic charge is equal to its valency. The elements having greater electronegativity show a negative charge while those with lower electronegativity show a positive charge.
(b)

Answer to Problem 57A
Group 1A elements form mono-positive ions.
Explanation of Solution
Group 1A comprises alkali metals that are highly electropositive monovalent elements. Hence, they form mono-positive ions.
(c)
Interpretation: The expected charges on the ions of elements of the given group should be found.
Concept Introduction: The charges on the ions depend on the valency and electronegativity of the respective element. The magnitude of the ionic charge is equal to its valency. The elements having greater electronegativity show a negative charge while those with lower electronegativity show a positive charge.
(c)

Answer to Problem 57A
Group 7A denotes the halogens. They form ions having a -1 charge.
Explanation of Solution
Halogens are highly electronegative elements with valency 1. So they form ions with a -1 charge.
(d)
Interpretation: The expected charges on the ions of elements of the given group should be found.
Concept Introduction: The charges on the ions depend on the valency and electronegativity of the respective element. The magnitude of the ionic charge is equal to its valency. The elements having greater electronegativity show a negative charge while those with lower electronegativity show a positive charge.
(d)

Answer to Problem 57A
Group 3A forms tri-positive ions. So the charge on the ions of Group 3A is +3
Explanation of Solution
Group 3A ions have three electrons in the valence shell, which it will lose to form trivalent cations. Thus the charge on Group 3A ions is +3.
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Chapter 9 Solutions
Chemistry 2012 Student Edition (hard Cover) Grade 11
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