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2015-02-11T21:57:38+05:30

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Atomic mass. Later on we discovered that the transition metals did not always have the same mass, which made it difficult to rely on his periodic table. We now arrange it in atomic number.
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2015-02-11T22:07:21+05:30

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He used the properties

1) Atomic masses

2) Similarity of chemical properties {which he selected as the important factor in arranging the elements}


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