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Potassium oxide is K2O.

It has 46 protons and 46 electrons (19 + 19 + 8 = 46).

If the most stable isotope of K and O are used (K-39 and O-16), then there will be 48 neutrons (20 + 20 + 8 = 48).

So the total number of sub atomic particles will be 140(46 protons + 46 electrons + 48 neutrons).

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