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Electronic Configuration

Write the electron configurations for Mg and Ar, using both the spdf notation and orbital box diagrams. Describe the relation of the atom's electron configuration to its position in the periodic table.

electron configuration for Mg___________
spdf____________________

orbital box diagram:

electron configuration for Ar_________________
spdf_______________________

orbital box diagram:

Describe the relation of the atom's electron configuration to its position in the periodic table:

Solution This solution is FREE courtesy of BrainMass!

The electronic configuration of Mg is

Mg: 1s2 2s2 2p6 3s2

The orbital box diagram is in the attached figure.

Mg is in the 2nd group of the periodic table.It has 12 electrons and hence is the 12th element in the periodic table. We can see from the electronic configuration that it can easily lose its two 3s electrons to become a stable element with completely filled energy levels. To attain a stable configuration it has to either give up its two 3s electrons or it has to accept 6 more electrons to its 3p orbital.

Due to the Pauli Exclusion Principle, each orbital, sublevel and primary level can only hold a certain number of electrons. Thus, if we thnk about adding electrons to a bare nucleus until we have the correct number for that atom, the electrons must go into a distinct set of orbitals. In the ground state of the atom, electrons will occupy the lowest energy orbitals first, and only fill the higher energy orbitals when no lower energy orbitals are left. The arrangement of electrons in an atom is known as its electronic configuration.

The electronic configuration of Ar is

Ar: 1s2 2s2 2p6 3s2 3p6

The orbital box diagram is in the attached figure.

Ar is an inert element. Its postion is in the 18th group of the periodic table. It has 18 electrons and hence is the 18th element of the periodic table. We can clearly see that all the levels of argon are completely filled and it is in a stable state. This accounts for its postion in the periodic table.

Best wishes.
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