Size of atoms decreases when moving left to right in a period because the increase in the number of protons increases the nuclear pull which decreases the size..... Thus in a particular period alkali atoms are largest and halogen atoms are smallest in size..... But why inert gases(noble gases) are slightly bigger in size than halogens??
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inert gases have already obtained stability
this tends to increase the repulsive force between electrons thus increasing the inter -shell distnace making it slightly larger than the halogens
this tends to increase the repulsive force between electrons thus increasing the inter -shell distnace making it slightly larger than the halogens
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Since noble or inert gases are always stable so they must come after halogens in order to show their stable property..
mrina123:
ya they will come after but why there size is slightly bigger than the halogens that was my que
Because they neither donate the ions and nor accept the ions so they have to be stable with their own electrons and hence cannot be smaller than halogens so they are slightly bigger than halogens..
thaxx
Ur welcome
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