Question : According to Mendeleev's periodic table, what was the atomic mass of eka-Aluminium which was later replaced by Gallium?
Option 1: 95
Option 2: 83
Option 3: 68
Option 4: 50
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Correct Answer: 68
Solution : The correct answer is 68.
Mendeleev organized the elements in ascending order of relative atomic mass, placing them nearby based on their similarities. The relative atomic mass for each element was determined by averaging the masses of its constituent isotopes. He assigned atomic masses of 44, 68 , 72, and 100 to the elements he labelled as eka-boron, eka-aluminium , eka-silicon, and eka-manganese.
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