wen determining the formula for a compound its important to no the valance no of each element suppose element a has a valance no of 3 an element b has a valence no of 2 if the two elements combine then wen writing the formula for the resulting compound wat subscript no will be give to element b 1 2 3 or 5

The formula will be A2B3, where A and B represent to two elements. B will have subscript 3.

To determine the formula of a compound when two elements combine, you need to consider their valence numbers. In this case, element A has a valence number of 3, and element B has a valence number of 2.

The valence number of an element represents the number of electrons it can gain, lose, or share when it reacts with another element to form a compound. To achieve stability, elements tend to gain or lose electrons to achieve a complete outer electron shell.

To write the formula for the resulting compound, you need to balance the valence numbers of the elements. In this case, since element A has a valence number of 3 and element B has a valence number of 2, they will combine in a ratio to equalize their valence numbers.

The lowest whole number ratio between 3 and 2 is 3:2. Therefore, for every one atom of element A with a valence number of 3, there are two atoms of element B with a valence number of 2.

To represent this ratio in a chemical formula, you must use subscripts. The subscript number tells you the number of atoms of that element in the compound. In this case, element A will have a subscript of 1, and element B will have a subscript of 2.

So, when writing the formula for the resulting compound, the subscript number for element B would be 2. The correct answer is 2.