what is the atomic mass of potassium（関連順）

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In the graphic , what is the atomic mass of potassium? 39 19 B C 39 20 19

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Explain the following: (i) Why argon (atomic mass `= 39.94)` has been placed before potassium

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Assertion (A): Atomic mass of potassium is 39. Reason (R ): An atom of postassium is

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結果 : what is the atomic mass of potassium