Periodic_trends

the noble gases inert gases which do not have any

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Unformatted text preview: gases which do not have any chemical reactivity) elements with outermost s and p sublevels which are full. ) Representative Elements (columns 1,2,13-17) elements that partially filled outermost s and p sublevels 3) Transition Elements (all metals except columns 1 and 2) elements whose outermost s and nearby d sublevels contain electrons 4) Inner Transition Elements (elements at the bottom of the periodic table) elements whose outermost s and nearby f sublevel generally contain electrons Writing electron configurations the easy way Yes there is a shorthand Electron Configurations repeat The shape of the periodic table is a representation of this repetition. When we get to the end of the column the outermost energy level is full. This is the basis for our shorthand. Write symbol of the noble gas before the element, in [ ]. Then, the rest of the electrons. Aluminum's full configuration: The Shorthand previous noble gas Ne is: 1s22s22p6 so, Al is: [Ne] 3s23p1 1s22s22p63s23p1 More examples Ge = 1s22s22p63s23p64s23d104p2 Hf = 1s22s22p63s23p64s23d104p65s2 4d105p66s24f145d2 Thus, Hf = [Xe]6s24f145d2 Thus, Ge = [Ar] 4s23d104p2 The Shorthand Again Sn- 50 electrons The noble gas before it is Kr Takes care of 36 Next 5s2 Then 4d10 Finally 5p2 [ Kr ] 5s2 4d10 5p2 Trends in Atomic Size First problem: Where do you start measuring from? The electron cloud doesn't have a definite edge. They get around this by measuring more than 1 atom at a time....
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This note was uploaded on 07/06/2011 for the course SCH 4U taught by Professor White during the Spring '10 term at Beacon FL.

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