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Physics

2 answers:

Anuta_ua [19.1K]3 years ago

6 0

The answer would be B, 19 protons. Hope this helps!

Inessa [10]3 years ago

6 0

The average mass of potassium is 39 amu and 19 electrons. 19 electrons mean there have to be 19 protons. 39-19=20. Therefore potassium has 20 neutrons. The answer is C, 20.

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