
Concept explainers
(a)
Interpretation:
Charge on aluminium ion of AlAs needs to be determined.
Concept introduction:
Aluminium belongs to group 13 in the periodic table. The

Answer to Problem 4E
Charge on aluminium ion in AlAs is + 3.
Explanation of Solution
The number of valence electrons in Al is + 3 thus, it can lose these 3 electrons to from stable ion. After the removal of 3 electrons it forms
Thus, the charge on Al is + 3.
(b)
Interpretation:
Charge on arsenic ion in AlAs needs to be determined.
Concept introduction:
Arsenic is a group 15 elements with 5 valence electrons. It can gain electron to from stable electronic configuration.

Answer to Problem 4E
Charge on arsenic ion is -3.
Explanation of Solution
Arsenic belongs to group 15 that is N family. It can gain 3 electrons to from stable electronic configuration thus, the charge on Arsenic will be -3.
(c)
Interpretation:
The total charge of AlAs needs to be shown zero.
Concept introduction:
As per zero charge rule a compound must be neutral. Positive charge of cation must be counter balanced by anions.

Explanation of Solution
The compound formed is AlAs where charge on Al is + 3 and that of As is -3. Thus, the overall compound is neutral with zero charge.
In AlAs there is one aluminium ion. Total charge of one aluminium ions is
There is one arsenic ion with -3 charges.
So, total charge will be:
(d)
Interpretation:
Total number of valence electrons must be calculated in AlAs.
Concept introduction:
Valence electrons are those which are present in the valance shell of an atom.

Answer to Problem 4E
There are total 8 valence electrons in AlAs.
Explanation of Solution
One aluminium atom has 3 valence electrons. One arsenic atom has 5 valence electrons.
Thus, the total valence electron will be sum of valence electron of Al and As.
T=3 + 5=8.
Chapter U1 Solutions
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