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Mendeleev's idea meant elements fell into the same ------- in his table

What was Mendeleev's big breakthrough?

Mendeleev's ideas were more widely accepted later on when new elements were discovered and ------ into the blank spaces in his table

In the modern periodic table, elements are arranged according to their?

Arranging by proton number was more successful as it solved problems in Mendeleev's table with Argon and Potassium being in the same?

In the modern periodic table we can find the group number of an element by looking at its what?