Let us compare the properties of atomic and molecular chlorine with the properties of an ion.

Chlorine atom Chlorine ion
+ 17Cl0 1s22s22p63s23p5 + 17Cl- 1s22s22p63s23p6
Chlorine atoms have an incomplete outer level, so they are chemically very active, they take electrons and are reduced.

That is why chlorine gas is poisonous, and when inhaled, the body becomes poisoned.

Chlorine ions have a complete external level, so they are chemically inactive and are in a stable electronic state.

Chlorine ions are part of table salt, the use of which does not cause poisoning of the body.

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