Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074



Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

Using an orbital box diagram and noble gas notation, show the electron configurations of uranium and of the uranium(IV) ion. Is either of these paramagnetic?

Interpretation Introduction


The electron configuration of Uranium and Uranium (IV) using an orbital box diagram and noble gas notation; also paramagnetic property has to be predicted.

Concept Introduction:

Electronic configuration: The electronic configuration is the distribution of electrons (e-) of an given molecule or respective atoms in atomic or molecular orbital’s.

Aufbau principle: This rule statues that ground state of an atom or ions electrons fill atomic orbitals of the lowest available energy levels before occupying higher levels. If consider the 1s shell is filled the 2s subshell is occupied.

Hund's Rule: The every orbital in a subshell is singly occupied with one electron before any one orbital is doubly occupied, and all electrons in singly occupied orbitals have the same spin.

Paramagnetic: The Paramagnetic properties are due to the presence of some unpaired electrons, and from the realignment of the electron paths caused by the external magnetic field.

Diamagnetic properties: In diamagnetic materials all the electron are paired so there is no permanent net magnetic moment per atom.

  • Electronic configuration for Uranium systems:

The Uranium (U) has six electrons in outermost shells; three electrons in (5f) orbitals, one electron in 6d- orbitals and two electrons in 7s-orbitals, the electrons filling method presented below.

AtomicnumberofUranium (U)= 92Complete (spdf)notationof(U)=1s22s22p63s23p63d104s24p64d105s25p64f145d106s26p65f36d17s2Orbital filling method=1s22s22p63s23p63d104s24p64d105s25p64f145d106s26p65f36d17s2spdfwith noble gas notation=[Rn] 5f3 6d1 7s2[AtomicnumberofRadon=86]Orbitalboxnotation       = [Rn]5f36d17s2 Hence, the electronic configuration of Uranium (U) is

1s22s22p63s23p63d104s24p64d105s25p64f145d106s26p65f36d17s2 and Noble gas configuration of [Rn] 5f3 6d1 7s2. The element has four unpaired electrons and exhibit paramagnetic property.

  • Electronic configuration for (U4+) systems:

When Uranium (U) was oxidized to (U4+) ions, it lost for four electrons in outermost (5f, 6d, 7s) shells. Than this orbital filling method are shown below

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