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Which of the following statements is in...

Which of the following statements is incorrect from the point of view of modern periodic table ?

A

Elements are arranged in the order of increasing atomic number.

B

There are eighteen vertical columns called groups.

C

Transition elements fit in the middle of long periods.

D

Noble gases are arbitrarily placed in eighteenth group .

Text Solution

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The correct Answer is:
D
Noble gases are arbitrarily placed in eighteenth group.
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