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On moving from left to right in a period...

On moving from left to right in a period in the periodic table, the size of the atom.

A

increase

B

decreases

C

does not change appreciably

D

first decreases and then increases

Text Solution

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The correct Answer is:
B
Due to larget positive charge on the nucleus, the electrons are pulled in more close to the nucleus and the size of the atom decreases. However, the size of atom of an inert gas in bigger than that of the preceding halogen atom. The greater size of the inert gas atom in a period is due to the structural stability of its outermost shell consisting of an octet of electrons.
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NCERT EXEMPLAR-PERIODIC CLASSIFICATION OF ELEMENTS-Periodic Classification Of Elements
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  2. Which one of the following does not increase while moving down the gro...

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  4. Which of the following set of elements is written in order of their in...

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  5. The three elements A, B and C with similar properties have atomic mass...

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  6. Elements have been arranged in the following sequence on the basis of ...

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  7. Can the following groups of elements be classified as Dobereiner's tri...

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  8. In Mendeleev's periodic table, the elements were arranged in the incre...

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  13. Compare the radii of two species X and Y. Give reasons for your answer...

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  14. Arrangement the following elements in increasing order of their atomic...

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  15. Identify and name the metal out of the following elements whose electr...

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  16. Write the formula of the product formed when the element A (atomic num...

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  17. Arrange the following elements in the increasing order of their metall...

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