Which of the following is a monatomic anion?

a) nh4+
b) fr+
c) so42–
d) f-

d) F⁻

Explanation:

An anion is an ion that has a net negative charge. Ions such as OH⁻, NO₃⁻ or Cl⁻ are anions.

Monatomic means that it is made of only one atom. Mono=one. Ions such as H⁺, Na⁺ or S²⁻ are monoatomic, whereas ions such as OH⁻, NH₄⁺ or CN⁻ are polyatomic.

With this information in mind, the option that is both monatomic and an anion is d), F⁻.

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