Statement (A) : Repeating the properties of elements in regular intervals is known as periodicity.
Statement (B) : Having the similar valence electronic configuration is cause of periodicity.
Statement (C) : Higher the inner electrons greater shall be the value of screening effect.

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All the above statements are correct

All the above statements are incorrect

A and B are correct but C is incorrect

A and B are incorrect but C is correct

answer is A.

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Detailed Solution

The meaning of the word periodicity is the particular property of elements is repeated at regular intervals such as 2,8,8,18,18 and 32. Therefore statement -A is correct.

The similar properties are observed with elements belonging to the same group which have been arranged in group after the difference of either 2or 8 or 18 or 32 in atomic number of similar valence shell electronic configuration recur after certain interval of atomic number, thus this will cause periodicity in the properties of elements. Thus the statement -B is correct.

The magnitude of the screening effect depends upon the number of inner electrons, thus the statement-C is correct.

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