assending order of elements according to the atomic mass
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Mendeleev noticed that when the elements were arranged in order of increasing atomic mass,certain similarities in their chemical properties appeared at regular intervals. ... In other words, when the elements are arranged in order of increasing atomic number, elements with
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Explanation:
18 Argon 39.948
19 Potassium 39.098
20 Calcium 40.078
21 Scandium 44.956
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