Question

In mendeleevs table why do you think the noble gases are placed in a separate group?

Answer 1

Answer:

Noble gases were discovered after mendeleev put forth the periodic table. Without disturbing the original periodic table, zero group was made to place noble gases. If noble gases are placed in original periodic table, there would be disturbance in original periodic table.

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Answer 2

Answer:

Noble gases were discovered long time after mendeleev put forth the periodic table. Without disturbing the original periodic table Mendeleev created the new group known as zero group.

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