Assertion : $3^{r d}$ period elements are called typical elements. Reason: They possess d sub-shell and show normal trend with other elements in all properties.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
In any group, $3^{r d}$ period elements represent the ideal properties of that group. This is because they possess 'd' sub shell and show normal trend with other elements in all properties. $2^{n d}$ period elements do not possess d sub shell and have extremely small atomic size. Therefore they cannot be studied as representatives of that group like $3^{r d}$ period elements.

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