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Q.

Which of the following is the lightest metallic element?


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a

Mg

b

Al

c

Li

d

Mn 

answer is C.

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Detailed Solution

Concept- The atomic number of Magnesium is 12 and its weight is 24.305 u . Similarly, we will see the atomic numbers and atomic weights for the other mentioned elements too. So, Atomic number of Aluminum is 13 and weight is 26.98 u. Atomic number of Manganese is 25 and weight is 55 u. Atomic number of Lithium is 3 and its weight is 6.9 u. Now, comparing these elements based on their atomic weights, we see that Lithium is the lightest.
Hence, the correct answer is option 3.
 
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