Open Question
Write the electron configurations of Co, Co^2+, and Co^3+.
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2. Atoms and the Periodic Table
Ions and the Octet Rule
Struggling with GOB Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Determine the electron configuration for the Cl– ion.
A
B
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D
E
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 1s^2 2s^2 2p^6 3s^2 3p^5, which accounts for all 17 electrons.
Recognize that Cl^- is an anion formed by the gain of one electron by a neutral chlorine atom.
Add one additional electron to the electron configuration of neutral chlorine to account for the extra electron in Cl^-. This additional electron will fill the 3p orbital.
Write the electron configuration for Cl^- as 1s^2 2s^2 2p^6 3s^2 3p^6, which now accounts for 18 electrons.
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