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Mendeleev's Periodic Table and Law

The groups fr...

Question

The groups from $1^{s t}$ to $7^{t h}$ of Mendeleev's periodic table were divided into ______ subgroups.

A

2

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B

3

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C

4

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D

1

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Solution

The correct option is A $2$
The groups from $1$ st to $7$ th of Mendeleev's periodic table were divided into two subgroups A and B.

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Q. Which periods were not divided into two series in the Mendeleev's periodic table?

Which group of elements were missing from the Mendeleev’s original periodic table?

Q. (a) State Mendeleev's periodic law.
(b) What chemical properties of elements were used by Mendeleev in creating his periodic table?
(c) State any three limitations of Mendeleev's classification of elements.
(d) Besides gallium, which two other elements have since been discovered for which Mendeleev had left gaps in his periodic table?
(e) Which group of elements was missing from Mendeleev's original periodic table?

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