Question

what is an anion?
this is a negative ion formed when an atom or group of atoms gains one or more electrons.
this is a positive ion formed when an atom or group of atoms loses one or more electrons.
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part b
what is a cation?
this is a positive ion formed when an atom or group of atoms loses one or more electrons.
this is a negative ion formed when an atom or group of atoms gains one or more electrons.
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Explanation:

Anions are negative ions formed by gaining electrons. Cations are positive ions formed by losing electrons.

Answer:

For "What is an anion?": This is a negative ion formed when an atom or group of atoms gains one or more electrons.
For "What is a cation?": This is a positive ion formed when an atom or group of atoms loses one or more electrons.