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What 3 properties did Mendeleev write on his cards to organize 63 elements?
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What 3 properties did Mendeleev write on his cards to organize 63 elements?

User Mozharovsky
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He wrote each element's melting point, density, atomic mass, and color on cards. The atomic mass of an element is the average mass of all the isotopes of that element. He tried arranging them in different ways.
User Bofanda
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