The Address of the Electrons - Twinsburg · electron in cloud. ! Takes energy for electron to pull...
Transcript of The Address of the Electrons - Twinsburg · electron in cloud. ! Takes energy for electron to pull...
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The Address of the Electrons
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� Each electron has a set of four numbers, called quantum numbers
� Each electron has a different set of numbers ¡ No 2 electrons in the same atom can have the
same 4 quantum number ¡ Pauli exclusion principle.
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� Attraction between protons in nucleus and electron in cloud.
� Takes energy for electron to pull away from nucleus
� Lower energy levels closer to nucleus � Higher energy levels farther from nucleus � Described by integers
¡ 1 is closest to nucleus (lowest enegry
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� Show the shape of the area that a electron is most likely moving around.
� 4 types ¡ s, p, d, and f ¡ Each requires a different amount of energy for an
e- to remain ¡ Lowest energy is s ¡ Highest energy is f
� Described by their energy level number and their subshell type level
� Example ¡ S orbital in energy level 2---2s
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� An area of high probability where an electron is located
� The specific orientation of the shape of the subshell
� S ¡ Has one orbital, holds 2 electrons
� P ¡ Has three orbitals, holds 6 electrons
� D ¡ Has five orbitals, holds 10 electrons
� F ¡ Has 7 orbitals, holds 14 electrons
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� The arrangement of electrons in an atom � 3 methods of writing electron configuration
¡ Boxes and arrows ¡ Spectroscopic notation ¡ Noble gas notation
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� From the German word "Aufbauen" which means "to build”
� Electrons will first occupy orbitals of the lowest energy level.
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� Aufbau Principle � Hund’s Rule
¡ Electrons are placed in their own orbitals before doubling up
� Pauli Exclusion Principle ¡ In order for electrons to share an orbital, they
must have different spin ¡ One spin up ¡ One spin down
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Sublevels
Number of electrons in the sub level 2,2,5
1s2 2s2 2p5
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� Use the last noble gas that is located in the periodic table right before the element.
� Write the symbol of the noble gas in brackets. � Write the remaining configuration after the
brackets. � Ex: Fluorine: [He] 2s2 2p5