
(a)
Interpretation:
Charge on lithium ion of Li3N needs to be determined.
Concept introduction:
Lithium is an alkali metal with valency 1. It belongs to group 1 of the periodic table. It can lose 1 electron to form lithium ion with + 1 charge.

Answer to Problem 3E
Charge on lithium ion in Li3N is + 1.
Explanation of Solution
As lithium has one valence electron because it belongs to group 1 of the periodic table so it will produce Li ion with + 1 charge.
(b)
Interpretation:
Charge on nitrogen atom of Li3N needs to be determined.
Concept introduction:
Nitrogen is a group 15 elements with 5 valence electrons. Thus, it can gain 3 electrons to from stable ion.

Answer to Problem 3E
Charge on nitrogen ion is -3.
Explanation of Solution
As valency of nitrogen is 3 so it will reacts with three monopositive lithium ion to make the compound overall neutral.
Here, N belongs to group 15 so it can take 3 electrons to form stable ion. Thus, the charge on the N is -3.(c)
Interpretation:
This is to be shown that charges on the ions added to zero.
Concept introduction:
As per zero charge rule a compound must be neutral. Total positive charge must be equal to total negative charge.

Explanation of Solution
In Li3N there are three lithium ions. Total charge of three lithium ions is
There is one nitrogen ion with -3 charges.
So, total charge can be calculated as follows:
(d)
Interpretation:
The total number of valence electrons must be calculated in all the atoms of Li3N.
Concept introduction:
Valence electrons are those which are present in the valance shell of an atom.

Answer to Problem 3E
There are total 8 valence electrons in Li3N.
Explanation of Solution
Each lithium has one valence electron. So three lithium have 3 valence electrons.
One nitrogen atom has 5 valence electrons. Thus, the total number of valence electrons will be sum of total valence electrons of Li and N.
Thus, total valence electron will be:
Chapter U1 Solutions
Living By Chemistry: First Edition Textbook
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