What is meant by a group in the Modern Periodic Table? How do the following change on moving from top to bottom in a group? i] Number of valence electrons ii] Number of occupied shells iii] Size of atoms iv] Metallic character of elements v] Effective nuclear charge experienced by valence electrons

What is meant by a group in the Modern Periodic Table? How do the foll

1.	What is meant by a group in the Modern Periodic Table? How do the following change on moving from top to bottom in a group? i] Number of valence electrons ii] Number of occupied shells iii] Size of atoms iv] Metallic character of elements v] Effective nuclear charge experienced by valence electrons
Answer» Solution :VERTICAL columns of the periodic table are known as groups. (i) The number of valence ELECTRONS remains constant when we move down the group. (II) The number of occupied shells increases down the group. (iii) The size of atom increases down the group. (iv) The metallic CHARACTER of elements increases down the group. (V) The effective nuclear charge decreases down the group.