Q. 35.0( 2 Votes )
The order of decreasing atomic size is:
A.Na < Mg < Al < Si
B. Na > Mg > Al > Si
C. Mg < Na < Al < Si
D. Mg > Na > Al > Si
We know that across the period atomic size decreases. Na has the greatest size in all these elements so it should come first this makes the option (c) and (d) invalid and in option (a) the arrows are wrong.
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Account for the following:
a. Cations are smaller in size than the corresponding atom.
b. The noble gases were discovered very late.Xam idea - Science
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