Covalent Bonds — Unit test

Question 17 • GA-GSE Physical Science A

Fluorine (F) and bromine (Br) are in the same group on the periodic table. How do atoms of these elements compare when they form bonds?

Answer

Both a fluorine atom and a bromine atom lose one electron, and both atoms become stable.

A fluorine atom becomes stable by losing one electron, but a bromine atom cannot become stable by losing only one electron.

Both a fluorine atom and a bromine atom gain one electron, and both atoms become stable.

A fluorine atom becomes stable by gaining one electron, but a bromine atom cannot become stable by gaining only one electron.

Explanation

Fluorine and bromine are both halogens in Group 17, so each has seven valence electrons. Each atom can gain one electron to fill its outer shell and become more stable. Therefore, choice C is correct: both fluorine and bromine gain one electron.

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