Chemistry, asked by Pawanruhela5465, 9 months ago

The elements, which were unknown at the time when Mendeleev prepared his peridic table , are(a) alkali metals (b) alkaline earth metals (c) halogens (d) noble gases

Answers

Answered by prawinkumar298
0

Answer:

Nobel gases were unknown at the time when Mendeleev prepared his periodic table

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