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Write a long answer to the following questions in a few more sentences:
Which group of elements could be placed in Mendeleev's ′ periodic table without disturbing the original order? Give reason.
Inert gases could be placed in Mendeleev's Periodic Table without disturbing the original order.
Noble gases: like , Neon and had been mentioned by various scientists even before Mendeleev. But these gases could be grouped together as noble gases much later than Mendeleev's discovery.
Noble gases: like , Neon and had been mentioned by various scientists even before Mendeleev. But these gases could be grouped together as noble gases much later than Mendeleev's discovery.
Mendeleev used () elements till his periodic table because these were the only known elements till his time. However, he was bold enough to leave gaps in his periodic table. The lie had predicted that more would be discovered in times to come.
Mendeleev's Periodic Table was the first comprehensive attempt to classify elements based on their chemical properties.
This is the main reason that new could be easily placed in Mendeleev's Periodic Table without disturbing the original order.
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