Mendeleev wrote the names of elements onto ____ to help him look for patterns. He put the cards in order of lightest to the ____ element and made groups based on the chemical and physical ____ of each element. ____ recognised that not all elements had been discovered yet. He left ____ in his table to place elements that scientists didn't yet know. By looking at the physical properties and chemical properties of elements next to gaps, he could even ____ the properties of these undiscovered elements.

How did Mendeleev produce the periodic table?

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