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A cation is a positively charged particle that is attracted to a negative cathode.

Cations are formed when an atom loses an electron to have a full outer shell. Metals usually lose electrons to form a cation. They have a positive charge because the atom now has more protons (positive) than electrons (negative).

Example Na+, Mg2+ , Al3+

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Q: How do you write the formula of a cation?
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