What state symbol would you use to show that a reacting substance was a gas?

(g)

Explanation:

A reacting substance can either be a solid, liquid or gas.

For instance:

A(s) + B(g) ---> AB(l)

In the reaction above, the reactants are "A", a solid with state symbol (s); while "B", a gas with state symbol (g); both form a product "AB", a liquid with state symbol (l).

Thus, (g) is the state symbol that shows the reacting substance was a gas.

answer: your mm

explanation:

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.