Question 46 of 48intermediate🔧 ApplyMCQ1 mark

Considering the elements B, Al, Mg, and K, the correct order of their metallic character is:

Exercise: EXERCISES | Q: 3.38 | (Page 26)
For More Understanding

Explanation

Option D is correct because metallic character increases down a group and decreases along a period from left to right. K is an alkali metal in Group 1, making it the most metallic. Mg is in Group 2 and Al is in Group 13 of the same period, so Mg is more metallic than Al. Al and B are in the same group (Group 13), with Al below B, making Al more metallic than B. Thus, the correct order is K > Mg > Al > B.

Solution Steps

  1. Step 1: Recall the periodic trend that metallic character increases down a group and decreases across a period from left to right.

  2. Step 2: Compare Mg and Al. Both are in the same period (Period 3), with Mg to the left of Al. Therefore, Mg > Al in metallic character.

  3. Step 3: Compare Al and B. Both are in the same group (Group 13), with Al below B. Therefore, Al > B in metallic character.

  4. Step 4: Compare K with the others. K is an alkali metal (Group 1) and is highly reactive, making it the most metallic among the given elements.

  5. Step 5: Combine the comparisons to get the final order: K > Mg > Al > B.

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