Elements, Atoms, Ions, And The Periodic Table Worksheet With Answers Page 6
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14• Energy levels can have sublevels when multiple orbitals are present.
Building Atoms by Orbital Filling
Amazingly, the "electron configurations" of the elements are "embedded" in the Periodic
Table.
Honk, if you can see this "embedded" information in the Periodic Table?
Analogy: The periodic table is actually a packing slip that tells how the electrons are packed
around the nucleus.
Electronic Configuration - the arrangement of electrons, in orbits or orbitals, around a nucleus
of an atom.
Electron Configuration and the Aufbau ( Building Up) Principle
A scheme used by chemist to obtain electronic configuration of a multi-electron atom in
the ground state by filling atomic orbital starting with lowest energy.
1s 2s 2p3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s 5f 6d… (building up principle)
If two or more orbitals exist at the same energy level, they are degenerate. Do not pair the
electrons until you have to.
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