Answer: Valency of Al in [tex]Al_2O_3[/tex] is +3.
Explanation:
The capacity of an element to gain or lose electrons is called valency of the atom or element.
The valency of oxygen is -2 is the compound [tex]Al_2O_3[/tex] and let the valency of Al is x over here.
Therefore, valency of x will be calculated as follows.
[tex]2x + \times 3(-2) = 0[/tex] (as the charge on compound is 0)
[tex]2x - 6 = 0[/tex]
[tex]x = +3[/tex]
Therefore, valency of Al in [tex]Al_2O_3[/tex] is +3.
