Interpretation:
The reason for the atomic masses in Mendeleev’s table different from today’s values needs to be explained.
Concept introduction:
Elements were grouped in Mendeleev's periodic table based on the fundamental characteristics,

Answer to Problem 80A
The arrangement of Mendeleev’s periodic table was related to the atomic ratios in which elements produced oxides, binary compounds with oxygen, while the modern periodic table is organized by the atomic numbers, that is, protons number found in a particular element.
Explanation of Solution
Mendeleev’s periodic table calculated atomic masses from the mass of atoms and
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