Q9 of 60 Page 140

It was found that the law of octaves was applicable only to:

After calcium, every 8th do not possess properties similar to that of the first.

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7

It was assumed by Newlands that only:

 8

Doberiener’s system of classification into triads was not found to be useful as he could identify only:

 10

The element X has the following electron configuration 2, 8, 8, 2. It means that it belongs to:

 11

Arrange the following elements in the order of their decreasing metallic character: Na, Si, Cl, Mg, Al