Electron configuration

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Presentation transcript:

Electron configuration

Electron configuration

Element Atomic number Electron configuration He 2 1s2 Ne 10 1s22s22p6 Ar 18 1s22s22p63s23p6 Kr 36 1s22s22p63s23p63d104s24p6 Xe 54 1s22s22p63s23p63d104s24p64d105s25p6 Rn 86 1s22s22p63s23p63d104s24p64d104f145s25p65d106s26p6

Short cut = Core notation Core notation takes the electron configuration of the last noble gas and adds the additional electrons, in their perspective orbitals, to show the same electron configuration of the element

Group 1 Group 6 O [He]2s22p4 S [Ne]3s23p4 Se [Ar]4s23d104p4 Te [Kr]5s24d105p4 Po [Xe]6s24f145d106p4 H 1S1 Li [He]2s1 Na [Ne]3s1 K [Ar]4s1 Rb [Kr]5s1 Cs [Xe]6s1 Fr [Rn]7s1

Exceptions Cr and Cu Cr (d4) borrows 1 electron from s-orbital Cr ([Ar] 4s1 3d5) half filled d orbital is very stable Cu fully filled d orbital Cu ([Ar] 4s1 3d10) filled d orbital is very stable

Electron configuration for ions Negative ion – add electrons to the last unfilled subshell Positive ion - electrons in outermost shell are removed first Remove p before s before d- electrons

Classwork: p 156 – 158 # 27 - 29