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Write out the complete electron configuration for a chloride ion

Write out the complete electron configuration for a chloride ion

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Answer #1

Chlorine atom (Cl) atomic number is: 17
Like all halogens, it is one electron less to have octet configuration.
Therefore, the electron configuration of Cl is:

1s2 2s2 2p6 3s2 3p5

Chlorine ion (Cl-) has one electron extra than Chlorine atom. Therefore, chlorine ion attains octet configuration.
The electron configuration of chlorine ion (Cl-) is:

1s2 2s2 2p6 3s2 3p6

it also represented as follows: [Ne]3s2 3p6

Hence, the answer: Cholorine ion (Cl-) electron configuration is : 1s2 2s2 2p6 3s2 3p6

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