E z1e ze2 close to the nucleus u r r

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Unformatted text preview: 1 " Z2 Z2 % E1 = !(13.6 ) $ 2 + 2 ' = !68 eV 2& #1 So from 1s2 to 1s2s configura;on takes 11 eV, which is huge in terms of chemical energy (~few eV) Thus He is extremely stable in its ground state, and is chemically inert. Building up the periodic table For larger atoms, we have a mass number A, Z protons and A ­Z neutrons in its core.  ­e  ­  ­ + +  ­(Z ­1)e Ze2 Close to the nucleus: U r = ! ,r # 0 4"!0...
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