Question

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Answer 1

HEY MATE........

(63 elements were known.)

(i) Compounds of these elements with oxygen and hydrogen were studied (formation of oxides and hydrides).

(ii) Elements with similar properties were arranged in a group.

(iii) Mendeleev observed that elements were automatically arranged in the order of increasing atomic masses.

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Answer 2

when mendeleef selected his work ,63 elements were known . he examined the relationship between the atomic masses of the elements and their physical and chemical properties ...he observed that most of the elements get a place in a Periodic Table & arranged in order of their increasing atomic masses .........

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