How does the atomic radius of the elements change on going (a) from left to right in periodic table and (b) down a group in the modern periodic table? Give reason in support of your answer.
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(a) On moving left to right in a periodic table the atomic radius decreases because the atomic size is decreasing. Due to same orbital
,only number of electrons increases,but orbital is same. Therefore, atomic radius decreases on moving left to right in a periodic table.
The decreasing order of atomic radius and size
is :
Li > Be > B > C > N > O > F > Ne
(B) On moving down a group in modern periodic table the atomic radius increases because the atomic size increasing. Due to addition of orbitals in atom down a group the atomic size increases. Therefore,the atomic radius increases in down a group.
The increasing order of atomic radius and size is :
Li < Na < K < Rb < Cs < Fr
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,only number of electrons increases,but orbital is same. Therefore, atomic radius decreases on moving left to right in a periodic table.
The decreasing order of atomic radius and size
is :
Li > Be > B > C > N > O > F > Ne
(B) On moving down a group in modern periodic table the atomic radius increases because the atomic size increasing. Due to addition of orbitals in atom down a group the atomic size increases. Therefore,the atomic radius increases in down a group.
The increasing order of atomic radius and size is :
Li < Na < K < Rb < Cs < Fr
This the answer.
If you like the answer, please mark it as brain list
Thanks for watching the answer.
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