Question

Mendeleev's predicted the existence of certain elements not known at the time and named two of them as Eka-silicon and Eka-aluminium.
1. Name the elements which have taken the place of these elements.
2. Mention the group and the period of these elements in the modern periodic table.
3. How many Valence electrons are present in each one of them?

Answer 1

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1. Germanium and gallium have taken the place of these elements.

2. Germanium—Group 14, Period 4

Gallium—Group 13, Period 4

3. They are metalloids.

4. In germanium, the number of valence electrons is 4 and in gallium it is 3.

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Answer 2

1. Germanium and gallium have taken the place of these elements.

2. Germanium - Group 14, Period 4.

   Gallium - Group 13, Period 4.

3. They are metalloids.

4. In germanium, the number of valance electrons is 4 and in gallium it is 3.