
Interpretation:
The electronic configuration of Neodymium and the block of the periodic table in which it is located needs to be determined.
Concept introduction:
Electronic configuration of an element is the arrangement of elements in different orbitals like s, p, d, f. The filing of the electrons in the orbitals follow the Aufbau Principle.

Answer to Problem 55A
The electronic configuration of Neodymium is as follows:
It is located on the f-block.
Explanation of Solution
Aufbau principle should be followed while writing the electronic configuration of element. According to this rule lower energy level are filled first and then the higher energy levels.
Neodymium has electronic configuration1s22s2 2p6 3s2 3p6 4s2 3d104p6 5s2 4d10 5p66s2 4f4 and it is located in the f-block of the periodic table.
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