Q5 of 60 Page 140

The scientist who showed that the atomic number of an element is a more fundamental property than its atomic mass is:

Moseley only proposed atomic number of an element is a more fundamental property than it’s

atomic mass by doing this prediction of properties of elements could be done with more precision.

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3

The order of decreasing atomic size is:

 4

The element with atomic number 18 belongs to which group:

 6

When Mendeleev started his work, the number of known elements was:

 7

It was assumed by Newlands that only: