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WEST-NES Chemistry (306) Practice Tests & Test Prep by Exam Edge

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WEST-NES Chemistry Sample Test

1 of 5

Which of the following elements is a monatomic ion?

Correct Answer:

fluoride.

the question asks which of the listed elements is a monatomic ion. the correct answer is fluoride. to understand why, it's important to clarify what a monatomic ion is. a monatomic ion consists of a single atom that has lost or gained electrons, resulting in a net positive or negative charge.

in the list provided, "fluoride" refers to the fluoride ion, which is a monatomic ion formed when the element fluorine (f) gains one electron to achieve a stable electronic configuration. the resulting ion is denoted as f^- and carries a single negative charge. the suffix "-ide" in chemistry typically indicates a negative monatomic ion formed from a single element. other examples include chloride (cl^-), oxide (o^2-), and hydride (h^-).

the term "fluorate" does not refer to a monatomic ion but rather to a compound containing the fluoride ion in a specific oxidation state, usually within a complex ion or part of a polyatomic ion. similarly, "fluorite" is not an ion but a mineral consisting of calcium fluoride (caf2). it is a naturally occurring compound and not an ion.

lastly, "hypofluorite" represents a polyatomic ion, not a monatomic one. it usually contains oxygen and other elements in addition to fluorine, forming ions like of^- in certain chemical compounds.

therefore, among the options provided, "fluoride" is the only monatomic ion, correctly identified by its -ide suffix, which typically denotes simple negative ions formed from single atoms.