
Concept explainers
(a)
Interpretation:
Lewis dot symbol of Te, I, K, Bi, In and Pb must be drawn. These must also be arranged according to the group number in the periodic table.
Concept Introduction :
Lewis dot symbol is the
(a)

Answer to Problem 3E
Lewis dot symbols for all the given elements are drawn below.
K (1), I (13), Pb (14), Bi (15) Te (16) I (17).
All the elements are arranged according to increasing group number.
Explanation of Solution
K, I, Pb, Bi, Te and I have 1, 3, 4, 5, 6 and 7 valence electrons respectively. The Lewis dot structures are shown as follows:
These belong to group 1, 13, 14, 15, 16 and 17 respectively. , all are arranged in increasing group number as follows:
K (1), I (13), Pb (14), Bi (15) Te (16) I (17).
Here, group number are in brackets.
(b)
Interpretation:
The number of covalent bonds each element would make must be determined.
Concept Introduction :
Number of covalent bonds depends on the valency of the element.
(b)

Answer to Problem 3E
K, In, Pb, Bi, Te and I will form 1, 3, 4, 3, 2, 1 covalent bonds respectively.
Explanation of Solution
Valency is equal to number of valence electrons (upto 4). When valence electrons are greater than 4 then valency is obtained by subtracting valence electrons from 8.
Thus valency for K, In and Pb are 1, 3 and 4 respectively as there are 1, 3, 4 valence electrons.
These will form 1, 3 and 4 covalent bonds respectively.
Bi, Te and I have 5, 6 and 7 valence electrons respectively. Thus valencies of these elements are 3, 2 and 1 respectively. So these will form 3, 2 and 1 covalent bond respectively.
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