What forms a brackish when it gain an electron from a metal?

I need to know for this for science homework. What the answer is for this question," Forms a saline when it gains an electron form a metal?"
Answers:
Any halogen will form a salt when it gain one electron from a metal. The halogens are F, Cl, Br, I and At.
An example of this is the bonding of Na + Cl. Sodium (the metal) loses one electron to chlorine (the halogen) to form sodium chloride, a salt.

Easy answer: Halogen

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