(achievement of Mendeleev periodic table) guys don't cheat please give correct answer
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Achievements:
1. Mendeleev's Periodic Table predicted the existence of some elements that were not even discovered.
2. When these elements were discovered they did not pose a problem to the table.
3. It could accommodate noble gases when they were not even discovered.
4. Only the elements with similar properties were placed together.
5. It could predict the properties of several elements on the basis of their position in the periodic table.
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