Mendeleev predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium.
- Name the elements which have taken the place of these elements.
- Mention the Group and the Period of these elements in the Modem Periodic Table.
- Classify these elements as metals, non-metals or metalloids.
- How many valence electrons are present in each one of them?
Answer:
- Germanium (Ge) and Gallium (Ga)
- Group 14; Period 4 and Group 13; Period 4
- Ge — Metalloid; Ga — Metal
- Ga — 3; Ge — 4