Question

Mendeleev’s periodic table had some blank spaces. What did they signify?

Answer 1

Answer:

Mendeleev's periodic table is an arrangement of the elements that group similar elements together. He left blank spaces for 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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Answer 2

Answer:

Mendeleev's periodic table is an arrangement of the elements that group similar elements together.

He left blank spaces for the undiscovered elements (atomic masses, element: 44, scandium; 68, gallium; 72, germanium; & 100, technetium)

so that certain elements can be grouped together.