Which element was not known when Mendeleev proposed his classification ?

Related Mcqs:

Which of the following will not form crystalline structure with opporitely charged ions_________________?

A. H+ B. H- C. Mg2+ D. Ca2+...

Which of the following possesses maximum hydration energy ?

A. Na+ B. K+ C. Mg+2 D. Ca+2...

Which one of the following element has highest oxidation state in its compounds ?

A. Cr B. Mn C. Sn D. O...

Oxidation state of an atom represents____________________?

A. Number of electrons gained B. Number of electrons lost C. Apparent charge in compound D. Its vacancies...

Halides in which halogen atoms act as a bridge between two atoms of the other element are called___________________?

A. Covalent halides B. Electronegative halides C. Polymeric halides D. Polymeric hydrides...