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Assertion: Increasing order of metallic ...

Assertion: Increasing order of metallic character is : `P lt Si lt Be lt Mg lt Na`
Reason: Metallic character increases along a period and decreases down a group.

A

If both assertion and reason are true and reason is the correct explanation of assertion

B

If both assertion and reason are true but reason is not the correct explanation of assertion

C

If assertion is true but reason is false

D

If both assertion and reason are false

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze both the assertion and the reason provided. ### Step 1: Understand the Assertion The assertion states the increasing order of metallic character as: \[ P < Si < Be < Mg < Na \] **Explanation**: - **Phosphorus (P)** is a non-metal and has the least metallic character. - **Silicon (Si)** is a metalloid, which means it has some metallic properties, but less than metals. - **Beryllium (Be)** is an alkaline earth metal, which has more metallic character than silicon. - **Magnesium (Mg)** is also an alkaline earth metal and has a higher metallic character than beryllium. - **Sodium (Na)** is an alkali metal and has the highest metallic character among the listed elements. ### Step 2: Understand the Reason The reason provided states: "Metallic character increases along a period and decreases down a group." **Explanation**: - This statement is partially true. Metallic character does indeed increase down a group (as you move from top to bottom in a group, the size of the atom increases, and the attraction between the nucleus and the valence electrons decreases, making it easier to lose electrons). - However, metallic character decreases across a period (from left to right), as the elements become more non-metallic. ### Step 3: Evaluate the Assertion and Reason - The assertion is **true** because the order given is correct. - The reason is **false** because metallic character does not increase along a period; it actually decreases. ### Conclusion Since the assertion is true and the reason is false, the correct answer would be that the assertion is true but the reason is false. ### Final Answer Assertion is true, but the reason is false. ---
To solve the question, we need to analyze both the assertion and the reason provided. ### Step 1: Understand the Assertion The assertion states the increasing order of metallic character as: \[ P < Si < Be < Mg < Na \] **Explanation**: - **Phosphorus (P)** is a non-metal and has the least metallic character. ...
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