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Number of Elements in a Period

The modern pe...

Question

The modern periodic table was given by:

A

Dobereiner

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B

Newlands

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C

Bohr

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D

Mendeleev

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Solution

The correct option is C
Bohr

The modern periodic table was prepared by Neils Bohr. It is also known as a long form of periodic table. It has been designed on the basis of the modern periodic law which states that "the properties of the elements are periodic functions of their atomic numbers." This periodic law was proposed by Henry Moseley.

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The modern periodic table was prepared by :

(a) Dobereiner (b) Newlands (c) Bohr (d) Mendeleev

Q. (a) The modern periodic table has been evolved through the early attempts of Dobereiner, Newland and Mendeleev. List one advantage and one limitation of all three attempts.

(b) Name the scientist who first of all showed that atomic number of an element is a more fundamental property than its atomic mass.

(c) State Modern Periodic law.

Q. Why Dobereiner, Newlands and Mendeleeff were not 100% successful in their classification of elements ? Why the modern table is relatively a better classification ? Predict the reason.

Q. Modern periodic table was given by

Q. Read the given statements carefully.
(a) There are total of 7 columns in the Modern periodic table.
(b) Mendeleev arranged the elements in the increasing order of their atomic numbers and according to their chemical properties
(c) Newlands’ law of Octaves worked well with lighter elements only.
The correct statement(s) is/are

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