Question

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Answer 1

Answer:

1. Mendeleev periodic law states that the chemical and physical properties of an element is the periodic function of their atomic masses.
2. mendleev had leave some gaps in his periodic table because he knows that some of the elements would be discovered in the future
3. rh4, ro2
4. atoms of element with similar chemical properties but different atomic masses

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Answer 2

Answer:

A) The properties of the elements are the periodic functions of its atomic mass.

B) he left some gaps for the elements which were not discovered at that time at would be discovered later.

C) ii.

D) ii.