Question

In Mendeleev’s Periodic Table, gaps were left for the elements to be discovered later.

Which of the following elements were there in periodic table already:

(a)Chlorine

(b)Silicon

(c)Oxygen

(d) All of the above​

Answer 1

Chlorine, oxygen and silicon were included in Mendeleev's periodic table. Germanium was discovered later which fit into the empty spaces left by Mendeleev and matched to the expected properties.

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