What are five elements that are missing from mendeleev's table?
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Group 18 elements are missing from Mendeleev's table which are helium, neon, argon, krypton, xenon and radon.
There included in the Nobel gases. These gases are chemically unreactive.
Because of their non-reactivity, they are called as inert. Helium gas is at the top of the group 18.
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