Answer:
It is extremely dangerous. It does not provide very much refined Metal. It generates a great deal of waste.
Explanation: Very harmful.
I have no formula however the process would be erosion... copper is a type of metal and when it rots from water or any type of liquid damage it erodes and gets that green coat.
Answer:
HI (hydrogen iodide).
Explanation:
Hello,
In this case, since iodine is in group VIIA, it has seven valence electrons at its outer shell, which means that it only needs one bond to attain the octet. Moreover, since hydrogen has just one electron at its outer shell, one hydrogen turns out enough to obey the octet when hydrogen and iodine bond as shown below:

Therefore, the required formula is:

Which is hydrogen iodide.
Best regards.
Answer:
The answer for 17 is maybe