He reaction described in part a required 3. 14 ll of calcium chloride. What is the concentration of this calcium chloride solution?.

The answer should be vaporization 

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The answer you are looking for is option d

Well you can immediately rule out a and d because if a metal were to lose or gain protons, then it would become a different element all together. the answer here is b because the positive symbol with a number refers to how many electrons the metal can give away to become stable.