Final answer:
To find out how many different elements are involved in a reaction, one must identify each unique element from the reactants and products of a valid chemical equation.
Step-by-step explanation:
To determine how many different elements are involved in the reaction, we need to examine each chemical species present. There seems to be a typo in the provided reaction, as BBr6 + 6HNO3 + 2B(NOs)3 + 6HB do not appear to be valid compounds or balanced chemical equations. However, we can discuss how to identify elements in a proper chemical reaction.
For a valid reaction, such as HNO3(aq) + Ba(OH)2(aq) → H2O(l) + Ba(NO3)2(aq), we count the unique elements present in all reactants and products. In this example, we have hydrogen (H), nitrogen (N), oxygen (O), and barium (Ba), which amounts to four different elements.
Similarly, in a balanced net ionic equation like 3Ba2+(aq) + 2PO43-(aq) → Ba3(PO4)2(s), the different elements involved are barium (Ba), phosphorus (P), and oxygen (O), totaling three different elements. These elements are B (boron), Br (bromine), H (hydrogen), and N (nitrogen). Each element is represented by a different chemical symbol in the reaction equation.