Which element was named as eka-silicon in Mendeleef classification of elements ?

Which element was named as eka-silicon in Mendeleev classification of elements?

Which element was named as Eka-aluminium earlier?

‘Eka' elements are

Which one of the following element is represented as Eka-Silicon in Mendeleev's periodic table?

A part of the early classification of elements has been given below: (a) Which law of classification of elements is illustrated by te above arrangement of elements? (b) Name the scientist who proposeed such a classification of elements. (c) Why is such a classification of elements compared with a characteristic of musical scale? (d) State one limitation of this classification of elements.