Calcium is an element With an atomic number of 20. The most common atoms of calcium have a mass number of 40. But some Atoms of calcium have a mass number of 44

What is meant but the tears atomic number

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Calcium is an element With an atomic number of 20. The most common atoms of calcium have a mass number of 40. But some Atoms of calcium have a mass number of 44

What is meant but the tears atomic number