The Newland’s law of octaves for the classification of elements was found to be applicable only up to the element :

Name the scientist who prepared modern periodic table.

In Mendeleev’s periodic table, gap was not left for one of the following elements. This element is :

According to Mendeleev’s periodic law, the elements were arranged in the periodic table in the order of:

The three elements having chemical symbols of Si, B and Geare :