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a. Who first put elements in a particular kind of order, using cards? b. How many elements did he know about then?
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a. Who first put elements in a particular kind of order, using cards? b. How many elements did he know about then?

User Ahmed Abdelhady
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Answer:

To put some order into his study of chemical elements, Mendeleev made up a set of cards, one for each of the 63 elements known at the time.

Step-by-step explanation:

User Homer
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