Answer:
Pb^+7
Explanation:
I placed the carrot there to signify the +7 is supposed to be small. It is plus seven because seven nuetrons are added
Well you have to mix chemicals which caused a chemical reaction. When you mix salt and ice the freezing point of liquid changes. the ice gets colder
A measure of thermal energy transferred between two different bodies at different temperatures would be the correct answer. So, the third option.
The best answer choice here would be 'Combination'
