that exist naturally between Hydrogen and Uranium. Both chemists placed the elements in increasing order of their atomic masses, grouped them in rows or periods of different lengths, and placed elements with similar chemical properties, such as valence, in the same group. They built their tables by listing the elements in rows or columns based on their atomic weight and starting a new row or column when the characteristics
that exist naturally between Hydrogen and Uranium. Both chemists placed the elements in increasing order of their atomic masses, grouped them in rows or periods of different lengths, and placed elements with similar chemical properties, such as valence, in the same group. They built their tables by listing the elements in rows or columns based on their atomic weight and starting a new row or column when the characteristics
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