Q32 of 181 Page 303

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

Both the elements are noble gases and the valence shell is fully filled with the valence electron.


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31

How does the tendency to gain electrons change as we go down in group 17 of the periodic table ? Why does it change this way ?

 32

Why does the size of the atoms progressively become smaller when we move from sodium (Na) to chlorine (Cl) in the third period of the periodic table ?

 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?

 33

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