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Today, ______ elements are known to the scientific world. 16

118

______ made the first attempt to classify elements. 16

Dobereiner

Newlands fitted all the known elements in a table of _____ boxes. 17

56

Newland’s law of octaves was found to be applicable only upto ______. 17

Calcium

Eka-Aluminium is now known as ______. 19

Gallium

All the elements after ______ are man made. 22

Uranium

Atomic radius is expressed in the unit _____ . 25

Picometer

1 picometer = _____ meter. 25

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05 August 2019 at 04:11