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Write the electron configurations of Co, Co^2+, and Co^3+.
9. Electrons in Atoms and the Periodic Table
Ions and the Octet Rule
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Determine the electron configuration for the Cl– ion.
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Verified step by step guidance1
Identify the atomic number of chlorine (Cl), which is 17. This means a neutral chlorine atom has 17 electrons.
Determine the electron configuration for a neutral chlorine atom. The configuration is: .
Recognize that Cl- is an anion, meaning it has gained one additional electron compared to the neutral atom.
Add one electron to the 3p orbital of the neutral chlorine electron configuration to account for the extra electron in Cl-. This results in: .
Verify that the total number of electrons is now 18, which matches the electron configuration of the noble gas argon (Ar), indicating a stable electron configuration for Cl-.
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