Q33 of 181 Page 303

Why could no fixed position be given to hydrogen in Mendeleev’s periodic table ?

The position of hydrogen is a big issue in Mendeleev’s periodic table, hydrogen is placed in the group of alkali metals because it also combines with halogens, oxygen and sulphar to form compounds having similar formulae.


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32

Helium and neon are unreactive gases. What, If anything, do their atoms have in common ?

 33

In the modern periodic Table, why does cobalt with higher atomic mass of 58.93 appear before nickel having lower atomic mass of58.71?

 34

What are the periods and group in a periodic table ? Give two characteristic of each.

 34

In terms of electronic configurations, explain the variation in the size if the atoms of the elements belonging to the same period and same group.