Which one of the following pairs of metals constitutes the lightest metal and the heaviest metal, respectively?

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Q: 116 (IAS/2008)
Which one of the following pairs of metals constitutes the lightest metal and the heaviest metal, respectively?

question_subject: 

Science

question_exam: 

IAS

stats: 

0,40,34,20,40,6,8

keywords: 

{'lightest metal': [0, 0, 1, 0], 'heaviest metal': [0, 0, 1, 0], 'metals': [1, 2, 2, 7], 'mercury': [0, 0, 2, 2], 'aluminium': [1, 0, 3, 2], 'osmium': [0, 0, 1, 0], 'lithium': [0, 0, 3, 6]}