How many columns did Dmitri Mendeleev’s 1869 periodic table have?

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Dmitri Mendeleev’s original 1869 periodic table contained 17 columns, which are now referred to as groups.1

He later revised this structure into an eight-group table in 1871, which allowed him to correct the known atomic weights of several elements and accurately predict the existence and properties of scandium, gallium, and germanium.1