You should never touch the subscripts, as that will change the composition. Hope I helped!
Answer:
<em>Hello, Your answer will be B,C,E, And F.</em>
Explanation:
An element is a substance whose atoms have same number of protons which means all atoms in an element have same atomic number. Elements are simplest substances which cannot be broken down by physical changes or chemical reactions. Elements are classified by their names and symbols. Hope That Helps!
I think it would be A because hazardous waste would most likely be found in dust, fumes etc. I'm not sure though.