State Mendeleev\'s periodic law. Why did he leave gaps in his periodic

1.	State Mendeleev\'s periodic law. Why did he leave gaps in his periodic table?
Answer» Mendeleev\'s periodic table is\xa0an arrangement of the elements that group similar elements together. He left\xa0blank spaces\xa0for the undiscovered elements (atomic masses, element: 44, scandium; 68, gallium; 72, germanium; & 100, technetium) so that certain elements can be grouped together.

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