Suppose that "element A" has a valence number of 3 and"element B has a valencenumber of 2. If the two numbers combine,then when writing the formula for resulting in the compound what subscript number will be given to element "B
The formula will be A2B3
The two "numbers" don't combine; the two ELEMENTS combine.
To determine the subscript number for element B in the formula of the compound formed by combining elements A and B, you need to apply the concept of valence electrons and electrovalency.
Valence number or valency refers to the number of electrons an atom of an element gains, loses, or shares while forming chemical bonds. In simple terms, it represents the combining capacity of an element.
In this case, element A has a valence number of 3 and element B has a valence number of 2. To form a stable compound, the total positive valencies of the combining elements should equal the total negative valencies.
In other words, the sum of the valencies should be zero for a compound to be electrically neutral.
Since element A has a valency of 3 and element B has a valency of 2, their combined valency should add up to zero. Considering this, we can determine the subscript number for element B:
3 (valency of A) + x (valency of B) = 0
x (valency of B) = -3
To balance out the valencies, we need a subscript of 3 for element B in the compound formula. Therefore, the formula for the resulting compound would be AB3, where A represents element A, and B represents element B.