Periodic Classi...

In a triad of $$A, B, C$$ elements, if the atomic masses of $$A$$ and $$C$$ respectively are $$100$$ and $$200$$, then the atomic mass of $$B$$ is:

Who is father of the Periodic Table of Elements?

For which of the pair Newland octave rule is not applicable?

Which of the following is arranged in order of increasing metallic character?

Which of the following is not a merit of Mendeleev's periodic table?

Mark the group which has maximum number of element in Mendeleev's periodic table:

The most important active step in the development of periodic table was taken by

Element with atomic number $$35$$ belongs to:

Whose name is not associated with the development of periodic table?

In which state C can show tetra valency ?