A potassium atom (atomic number 19) loses an electron while forming a bond with another atom. Which best describes the potassium ion that forms?

When a potassium atom loses an electron, it loses a negatively charged particle, so the resulting ion has a positive charge. Potassium has one valence electron, and losing it leaves the ion with one fewer valence electron than a neutral potassium atom. Therefore, the best description is a positive ion with one less valence electron.

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