(b) How do the following change: (i) Number of shells of the 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.
(i) The number of shells of elements in a group gradually increase downwards. (ii) The number of valence electrons of the elements in moving from left to right along a period gradually increase. (iii) Atomic radius decreases from left to the right. (iv) Atomic size increases down a group.
