Answer:
I think it's 78. I might be wrong I'm not sure.
Explanation:
When a metal undergoes a reaction, especially with a nonmetal, you should look for the formation of salts or the formation of precipitates in the case the product is not soluble to water. Metals loses electrons to form positive ions which then reacts to nonmetals that are negatively charged ions.<span />
Hypothesis
Therefore the last step in the scientific method is proposing a hypothesis or obtaining a conclusion
Im not sure but i think its hbr. i hope im right and i hope this helped,
it's true ....
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