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

How could the modern periodic law remove various anomalies of Mendeleev’s periodic table? Explain with examples.

Name the scientist who prepared modern periodic table.

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

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