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Mendeleev's Periodic Table and Law

how eka boron...

Question

how eka boron could be scandium as they both are placed in different groups in modern periodic table.

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Solution

In the mandeleev table , scandium is placed below boron .

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Similar questions

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

(b) Mention the period/periods of these elements in the modern periodic table.

(c) Write the group/groups of these elements in the modern periodic table.

(d) Classify these elements as metals, non-metals or metalloids.

(e) How many valence electrons are present in the atoms of each of these elements?

Q. Elements in the periodic table are classified into groups as they show similarities in properties with the elements of the respective groups. Identify the element which shows anomalous behavior so that it can be placed in two different groups of the periodic table?

Q. The element eka-silicon in Mendeleev's period table is known as ________ in the modern periodic table.

How many groups are there in the modern periodic table?

Q. Assertion :Hydrogen can be placed in both I A group and VII A group of the modern periodic table. Reason: Similarity in properties with both IA and VII A group.

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