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An atom that has 19 protons, 21 neutrons, and 18 electrons has a mass of ____? *
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An atom that has 19 protons, 21 neutrons, and 18 electrons has a mass of ____? *

User Kuba Wyrobek
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Answer:

19 - Potassium - K.

Step-by-step explanation:

User Steve Staple
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