A particle P has 18 electrons, 20 neutrons and 19 protons. This particle must be:

A molecule

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A binary compound

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An anion

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A cation

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Solution

Potassium $K^{+}$

Because the particle P has 19 protons, this means that its atomic number is 19 and hence it is a potassium particle. It has 18 electrons means it has lost an electron, therefore it is a positive ion.

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