The total number of atoms remains unchanged, <em>always.</em> But the chemical properties change :)
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Answer:
endothermic
Explanation:
Heat is added to make the process possible.
Explanation:
The idea here is that you need to use the Periodic Table of elements to find the mass number of the most common isotope of phosphorus, P.
you have to show us the rest of it because we have no idea what your looking at. I'm sorry
