How do the following change ? (a) Number of shells of elements as we go down a group. (b) Numberofvalenceelectronsofelementsonmoving from, left to right in a period. (c ) Atomic radius in moving from left to right along a period. (d) Atomic size down a group.

How do the following change ? (a) Number of shells of elements as we

1.	How do the following change ? (a) Number of shells of elements as we go down a group. (b) Numberofvalenceelectronsofelementsonmoving from, left to right in a period. (c ) Atomic radius in moving from left to right along a period. (d) Atomic size down a group.
Answer» Solution :(a) Numberofshellsofelementsgoesonincreasingdownthe group. (b) Numberofvalenceelectronsofelementsgoesonincreasing on moving from left to right in a period eg. Lithium has 1, berylliumhas2,boronhas3,carbonhas4,nitrogenhas5, oxygen has 6, fluorine has 7 and NEON has 8 VALENCE electrons. (c ) Atomic RADIUS goes on decreasing in moving from left to right along a period. (d) atomic SIZE goes on INCREASING down a group.