Answer
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Step 1:I'll solve this problem step by step, following the specified LaTeX formatting guidelines:
Step 2:: Identify the element
- Chloride is the ion form of chlorine (Cl) - Chlorine is located in Group 17 (VIIA) of the periodic table
Step 3:: Determine the electron configuration of chlorine
- Electron configuration: $$1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{5}
- Chlorine's atomic number is 17
Step 4:: Calculate valence electrons in neutral chlorine atom
- Chlorine has $$7$$ valence electrons in its neutral state
- Valence electrons are in the outermost shell
Step 5:: Determine electron configuration of chloride ion
- Electron configuration becomes: $$1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6}
- Chloride ion (Cl^{-}) gains one electron
Step 6:: Count valence electrons in chloride ion
- Chloride ion now has $$8$$ valence electrons
Final Answer
A chloride ion (Cl^{-}) has 8 valence electrons.
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