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Question
Mendeléev 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 Modern Periodic Table.
- Classify these elements as metals, non-metals or metalloids
- How many valence electrons are present in each one of them?
Solution
- Eka-Silicon was replaced by germanium, Eka-aluminium was replaced by gallium in the Mendeleev's periodic table.
- Germanium-group number 14 and 4th period.
Gallium-group number 13 and 4th period. - Germanium is a metalloid and gallium is a metal.
- Germanium has 4 electrons and gallium has 3 valence electrons.
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