`._(90)Th` a member of `III` group on losing `alpha-` particles forms a new element belonging to:

""_(90)Th , a member of III group on losing alpha -particle forms a new element belonging to

._(90)Th is a member of III group . After losing alpha -particle it forms a new element belonging to :

._(90)Th is a member of III group . After losing alpha -particle it forms a new element belonging to : a) I group b) II group c) III group d) IV group

Group 2 elements belong to

._(90)Th^(232) belongs to III group. It items an alpha -particle. The daughter element belongs to a. I group b. II group III. Group d. IV group

._(90)Th^(232) belongs to III group. It items an alpha -particle. The daughter element belongs to a. I group b. II group III. Group d. IV group

The element belonging to Group 17 is

The element belonging to group 17 is

When radium atom (belonging to group II) loses an alpha -particle forming a new element, the latter is placed in :