Multiple Choice
What is the net charge of an ion that consists of 10 electrons and 9 protons?
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2. Atoms & Elements
Ions
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Which ion is formed when an atom of fluorine (F) gains one electron?
A
F_2^{+}
B
F^{-}
C
F^{+}
D
F_2^{-}
Verified step by step guidance1
Understand that fluorine (F) is a halogen with 7 valence electrons and tends to gain one electron to achieve a full octet, which is a stable electron configuration.
When an atom gains an electron, it becomes negatively charged because electrons carry a negative charge.
Write the symbol for fluorine and indicate the gain of one electron by adding a negative charge: $F^{-}$.
Recognize that $F_2^{+}$ and $F_2^{-}$ represent molecular ions of fluorine gas, not a single fluorine atom, so they are not correct for this question.
Conclude that the ion formed when a fluorine atom gains one electron is the fluoride ion, represented as $F^{-}$.
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