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PART V: REVIEWING PCAT CHEMISTRY
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The energy levels order above can be approximated with the simple memory device shown below to determine the order of lling of the orbitals First the possible orbitals are listed in a triangle Orbitals that are not listed are not used in lling the known atoms in the periodic table
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The order of lling may be traced by drawing diagonal lines slanting from the lower right to the upper left, as shown in the diagram The resulting order 1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s 5f 6d 7p will be adequate for most atoms, with a few exceptions The periodic table itself may also be used to determine the lling order The electron con guration for an element lists the orbitals that contain electrons and the number of electrons in each orbital There are several ways to represent the electron con guration Line diagrams use lines to represent the orbitals and arrows to represent the electron spin An up arrow corresponds to ms = +1 2 and a down arrow corresponds to ms = 1 2 The aufbau (German for to build up ) approach is generally used Hydrogen is rst with one electron and one proton Successive elements are created by adding one proton to the nucleus and one electron to the next lowest available orbital, following Hund s rule when necessary The number in parentheses is the atomic number = number of electrons Below are line diagrams for the rst 10 elements H (1) _ 1s
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He(2) 1s Li(3) Be(4) B(5) 1s 1s 1s 2s 2s 2s 2p
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C(6) N(7) O(8) F(9) 1s 1s 1s 1s 2s 2s 2s 2s 2s 2p _ 2p _ 2p _ 2p 2p (Separate orbitals due to Hund s Rule)
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CHAP 10: GENERAL CHEMISTRY
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Ne(10) 1s
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Line diagrams become cumbersome as the number of electrons increases Orbitals may be represented as a number-letter combination The number of electrons in an orbital is represented as a superscript The ten electronic con gurations above may be rewritten as: H He Li Be B C N O F Ne 1s1 (Pronounced one s one ) 1s2 1s22s1 1s22s2 1s22s22p1 1s22s22p2 1s22s22p3 1s22s22p4 1s22s22p5 1s22s22p6 = [Ne]
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Because the electrons in neon will also be present in all following atoms, the electron con gurations for each noble gas may be abbreviated as shown above This abbreviation will also be used in the following electron con gurations for the next eight elements Na Mg Al Si P S Cl Ar [Ne]3s1 [Ne]3s2 [Ne]3s23p1 [Ne]3s23p2 [Ne]3s23p3 [Ne]3s23p4 [Ne]3s23p5 [Ne]3s23p6 = [Ar]
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The next 18 elements will ll the 4s(2e ), 3d(10e ), and 4p(6e ) orbitals A more common problem is to write the electron con guration of a given element EXAMPLE: What is the electron con guration of Pt Pt has 78 electrons Fill the orbitals in order until 78 electrons are placed in orbitals
PART V: REVIEWING PCAT CHEMISTRY
Pt 1s22s22p63s23p64s23d104p65s24d105p66s2 4f14 5d8 When the Russian chemist Dmitri Mendeleev prepared the original periodic table, he placed elements in groups by their chemical properties before the electron had ever been discovered The modern view of the periodic table recognizes that the elements are in groups because they have similar electron con gurations The shape of the periodic table can now be understood: The rst two columns (groups 1 and 2) are where the s orbitals are being lled The last six columns (groups 13 18) are where the p orbitals are being lled The ten columns in the middle (groups 3 12) are where the d orbitals are being lled The two rows at the bottom of the table (the lanthanide and actinide series) are elements where the f orbitals are being lled The electron con gurations of the alkali metals are generalized as [NG]ns1 where [NG] is the electron con guration of the preceding noble gas The electron con gurations of the alkali metal cations are those of each immediately preceding noble gas, for example, Na+ = [Ne] Electron con gurations of the noble gases are called core electrons These electrons are especially stable and do not normally take part in chemical reactions A lled set of d electrons is unreactive and considered part of the core Electrons that are not contained in the core electrons are called valence electrons Valence electrons are the chemically reactive electrons Each alkali metal has one valence electron (the ns1 electron) The valence electron con guration is a function of the group in the periodic table The valence electron con gurations for each of the main group elements are: Group 1 e con guration ns1 number of valence e 1 2 13 14 15 16 17 18 2 2 1 2 2 2 3 2 4 2 5 ns ns np ns np ns np ns np ns np ns2np6 2 3 4 5 6 7 8
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