Sorry idk
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Answer:
The Sandmeyer reaction is a chemical reaction used to synthesize aryl halides from aryl diazonium salts using copper salts as reagents or catalysts. It is an example of a radical-nucleophilic aromatic substitution.
Answer: The balanced equation is
.
Explanation:
A chemical equation which contains same number of atoms on both reactant and product side is called a balanced chemical equation.
For example, 
Here, number of atoms on reactant side are as follows.
The number of atoms on product side are as follows.
In order to balance this equation, multiply Ca by 5 on reactant side. Multiply V by 2 and CaO by 5 on product side. Therefore, the equation can be rewritten as follows.

Now here, number of atoms on reactant side are as follows.
The number of atoms on product side are as follows.
Since, there are same number of atoms on both reactant and product side. So, the equation is now balanced.
Thus, we can conclude that the balanced equation is
.
There isn't really a specific number of isotopes that elements have to have. But the isotopes are determined by the average mass of the element found in nature. And elements have varying masses because neutrons) leave and enter the atom. (neutrons are big enough that leaving the atom cause a difference in mass but electrons leaving will not, since they are so small)