Question
Mendeleev predicted the existence of certain elements not known at that time and named two of them as eka - aluminium, and eka - silicon.
- Name the element which has taken the place of $(i)$ eka - aluminium, and $(ii)$ eka - silicon.
- Mention the period/ periods of these elements in the modern periodic table.
- Write the group/ groups of these elements in the modern periodic table.
- Classify these elements as metals, non - metals or metalloids.
- How many valence electrons are present in the atoms of each of these elements$?$
