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Assertion:Metallic character is highest ...

Assertion:Metallic character is highest at the extremely left side of the periodic table.
Reason:Ionization enthalpy increases across a period.

A

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

B

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

C

Assertion is correct but Reason is incorrect.

D

Both Assertion and Reason are incorrect

Text Solution

AI Generated Solution

The correct Answer is:
To solve the assertion-reason question, we will analyze both the assertion and the reason step by step. ### Step 1: Understanding the Assertion **Assertion:** Metallic character is highest at the extremely left side of the periodic table. - The extremely left side of the periodic table corresponds to Group 1 elements (alkali metals). - These elements have larger atomic sizes compared to other elements in the same period due to their lower effective nuclear charge. - The larger atomic size makes it easier for these elements to lose their outermost electrons, which is a characteristic of metals. - Therefore, the assertion is correct: metallic character is indeed highest at the extremely left side of the periodic table. ### Step 2: Understanding the Reason **Reason:** Ionization enthalpy increases across a period. - Ionization enthalpy (or ionization energy) is the energy required to remove an electron from an isolated atom. - As we move across a period from left to right, the atomic size decreases due to an increase in effective nuclear charge (the pull of the nucleus on the electrons). - With a higher effective nuclear charge, it becomes more difficult to remove an electron, thus requiring more energy. - Hence, ionization enthalpy increases across a period, making the reason correct. ### Step 3: Connecting Assertion and Reason - The assertion states that metallic character is highest at the left side of the periodic table, while the reason explains that ionization enthalpy increases across a period. - The increase in ionization enthalpy across a period means that elements on the right side of the periodic table (non-metals) hold onto their electrons more tightly, thus exhibiting less metallic character. - Conversely, the lower ionization enthalpy of elements on the left side (metals) allows them to lose electrons more easily, which is directly related to their metallic character. - Therefore, the reason is a correct explanation for the assertion. ### Conclusion Both the assertion and reason are correct, and the reason correctly explains the assertion. ### Final Answer The correct answer for this question is **Option A**: Both assertion and reason are correct, and the reason is the correct explanation for the assertion. ---
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