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Which set of properties correctly describes a bromine-79 atom with a -1 charge?
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2. Atoms & Elements
Ions
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Which of the following represents the composition of the ion typically formed by fluorine?
A
10 protons, 9 electrons
B
8 protons, 9 electrons
C
9 protons, 8 electrons
D
9 protons, 10 electrons
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Recall that the number of protons in an atom defines the element. Fluorine has an atomic number of 9, which means it has 9 protons.
Understand that the ion typically formed by fluorine is the fluoride ion, which occurs when fluorine gains one electron to achieve a full outer shell.
Since a neutral fluorine atom has 9 electrons (equal to its 9 protons), gaining one electron means the fluoride ion has 10 electrons.
Therefore, the composition of the fluoride ion is 9 protons and 10 electrons.
Review the options and identify that the correct composition for the fluoride ion is 9 protons and 10 electrons.
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