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An atom starts with 20 electrons and 20 protons; after a reaction, it has 18 electrons and 20 protons.
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An atom starts with 20 electrons and 20 protons; after a reaction, it has 18 electrons and 20 protons.

User Dspeyer
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Answer:

(+20) + (-18) = +2

Step-by-step explanation:

User Colby
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