Which among the following were not discovered by the time , Mendeleev published his periodic table?

Which among the following were not discovered by the time , Mendeleev

1.	Which among the following were not discovered by the time , Mendeleev published his periodic table?
A.	Lathanides
B.	Actinides
C.	Noble Gases
D.	Halogens
Answer» D. Halogens

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Which among the following were not discovered by the time , Mendeleev published his periodic table?

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