. How do the following change


(i)  Number of shells of elements as we  go  down a group.

(ii)  Number of  valence electrons of  elements on  moving from left to right in  a period.

(iii) Atomic  radius in  moving from  left  to right along a period.

(iv)  Atomic  size  down a group

 

Best Answer

Ans. (i) As we  go down in a group, a new  shell  of electrons is added  to the atoms  at every  step.

(ii) On  moving from  left  to  right  in  a  period, the  number of  valence  electrons increases from  1 to 8.          

(iii) On moving from left to right in a period  the atomic  radius of elements decreases due  to the large positive  charge  on the nucleus, the electrons are pulled in more close  to the nucleus.

(iv) On  going  down in a group, the  size  of  the atoms increases as a new  shell  of electrons is added to the atoms  at every  step

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