Q8 of 40 Page 5

Why do you think the noble gases are placed in a separate group ?

Nobel gas are intert elements. They have unique properties compared to other elements, thus they are placed in a separate group in periodic table.

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6

Two elements X and Y have atomic numbers 10 and 14 respectively. Identify the group numbers of these elements in the periodic table.

 7

Why was the position of hydrogen not fixed in Mendeleev's periodic table?

 9

Besides gallium, which other elements have since been discovered for which gaps were left by Mendeleev in his periodic table? (any two)

 10

Account for the following:

a. Cations are smaller in size than the corresponding atom.


b. The noble gases were discovered very late.