Which of the following elements are placed at the bottom of the modern periodic table?

Actinides

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Lanthanides

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Metals

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Both A and B

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Solution

The correct option is C Both A and B
Lanthanides and actinides were not placed in the Mendeleev's periodic table. However, they were placed at the bottom of the modern periodic table in different f-block elements.

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Out of the first 20 elements in the modern periodic table which are metals?

Mendeleev predicted the existence of certain elements not known at that time and named two of them as eka-aluminium, and eka-silicon.

(a) Name the element which has taken the place of (i) eka-aluminium and (ii) eka-silicon

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