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Question
Which group of elements could be placed in Mendeléev's Periodic Table without disturbing the original order? Give reason.
Solution
Noble gases could be placed in Mendeléev's Periodic Table without disturbing the original order.
According to Mendeleev’s classification, the properties of elements are the periodic function of their atomic masses and there is a periodic recurrence of elements with similar physical and chemical properties.
Noble gases like helium (He), neon (Ne) and argon (Ar) have been mentioned in many a context before Mendeleev's periodic table was discovered. These gases were discovered very late because they are very inert and present in extremely low concentrations in our atmosphere. One of the strengths of Mendeléev’s periodic table was that, when the noble gases were discovered, they could be placed in a new group named zero group after the 8th group without disturbing the existing order.
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