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Groups and Periods (Mendeleev's)

In Mendeleev ...

Question

In Mendeleev periodic table few elements that are chemically similar are placed in separate ________.

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Solution

In Mendeleev's periodic table, he placed some chemically similar elements in different groups.
This was one of the many other drawbacks of his periodic table. In the long form of the periodic table, these errors are not present.

The correct answer is groups.

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Similar questions

(a) On what basis did Mendeleev arrange the elements in his periodic table?

(b) On what basis are they arranged now?

Q. (a) Explain why:
(i) All the elements of a group have similar chemical properties.
(ii) All the elements of a period have different chemical properties.

(b) The atomic radii of three elements X, Y and Z of a period of the periodic table are 186 pm; 104 pm and 143 pm respectively. Giving a reason, arrange these elements in the increasing order of atomic numbers in the period.

Q. In the Mendeleev's periodic table the elements with similar chemical properties are in the same ______.

Q. Atoms of elements in a group on the periodic table have similar chemical properties. This similarity is most closely related to the :

Q. Question 44 (c)
Atomic number of a few elements are given below 10, 20, 7, 14. Identify the periods of these elements in the Periodic Table.

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Groups and Periods (Mendeleev's)

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