Question
The elements Z = 107 and Z = 109 have been made recently; element Z = 108 has not been made. Indicate the groups in which you will have the above elements.
Solution
The last element of the actinoid series is lawrencium (103Lr) in which 5f subshell is complete.
Thereafter, the filling of 6d subshell which started at actinium (89Ac) will continue. Therefore, ten elements i.e. Ac (Z = 89), and elements with atomic number 104 to atomic number 112 should belong to the 4th transition series. In other words, all the three elements with Z = 107, Z = 108 and Z = 109 are d-block elements. Their respective groups in the periodic table will be,
(i) Element (Z = 107) =
(ii) Element (Z = 108) =
(iii) Element (Z = 109) =
Thereafter, the filling of 6d subshell which started at actinium (89Ac) will continue. Therefore, ten elements i.e. Ac (Z = 89), and elements with atomic number 104 to atomic number 112 should belong to the 4th transition series. In other words, all the three elements with Z = 107, Z = 108 and Z = 109 are d-block elements. Their respective groups in the periodic table will be,
(i) Element (Z = 107) =
(ii) Element (Z = 108) =
(iii) Element (Z = 109) =
