CH-1171

Electronic configuration

Chemistry · Secondary 4 · Medium · Electronic configuration

Which statement about the electronic configuration of a chloride ion,

Cl^-

, is correct?
(Chlorine has proton number 17.)

It has 16 electrons with configuration $2,8,6$ .
It has 17 electrons with configuration $2,8,7$ .
It has 18 electrons with configuration $2,8,8$ .
It has 18 electrons with configuration $2,7,9$ .

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