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Final answer:
The detailed answer addresses the number of protons, neutrons, and electrons in the element chlorine and its corresponding atomic number and mass. It also identifies the group and period to which chlorine belongs.
Explanation:
a) For the element with 17 protons, the atomic number is 17, so it is chlorine. Since it has 18 neutrons, the mass number is 35. We find that chlorine has 17 electrons as well.
b) Chlorine is in group 17 and period 3.
c) The element is chlorine (Cl).
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