A total of _____ elements were known when Mendeleev proposed his periodic table.

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Solution

Mendeleev arranged the elements based on their atomic masses.
He believed that the properties of all elements depend on their atomic masses.
At his time, the periodic table had a total of 63 elements.
Hence, a total of 63 elements were known when Mendeleev proposed his periodic table.

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A total of _____ elements were known when Mendeleev proposed his periodic table.

Mendeleev arranged the elements based on their atomic masses.He believed that the properties of all elements depend on their atomic masses.At his time, the periodic table had a total of 63 elements. Hence, a total of 63 elements were known when Mendeleev proposed his periodic table.

Mendeleev arranged the elements based on their atomic masses.
He believed that the properties of all elements depend on their atomic masses.
At his time, the periodic table had a total of 63 elements.
Hence, a total of 63 elements were known when Mendeleev proposed his periodic table.