Lect_W7_151 Weso(short) - General Chemistry CHEM 151 Week 7...

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UA GenChem General Chemistry CHEM 151 Week 7
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UA GenChem Electrons in Atoms Electrons in Atoms Electrons in an atom can be classified into two main groups: CORE electrons : Strong attraction to protons in the nucleus (closer) Unavailable for exchange or bonds. VALENCE electrons : Weaker attraction (farther) and easier to remove. Exposed to other atoms for interaction Na = [ Ne] 3s 1 CORE ELECTRONS VALENCE ELECTRONS
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UA GenChem To explain how two or more different atoms interact, we need to better understand the electrical nature of atoms. How do atoms interact? How do atoms interact? Let’s look at another property trend X + 1e 1- X 1- The energy of adding an electron to an atom is called the ELECTRON AFFINITY
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UA GenChem Negative = what does that mean ? X + 1e 1- X 1- experiment What is the Trend? Electron Affinity Electron Affinity
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UA GenChem Consider this interaction: a metal with a non- metal . What might happen to the valence electrons? Metal: Low ionization energy Low electron affinity Non-metal: High ionization energy High electron affinity FORM TWO IONS +1 cation -1 anion electron WHY? Atomic Interactions Atomic Interactions
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UA GenChem Ion Electron Configurations Ion Electron Configurations To form To form anions anions , just add electrons in the established , just add electrons in the established sequence. sequence. When electrons are gained or lost, the electron configuration changes (thus, the chemical properties change ). If the orbitals have the same n, remove first the electrons If the orbitals have the same n, remove first the electrons in in f f d p p s s orbitals. orbitals.
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Lect_W7_151 Weso(short) - General Chemistry CHEM 151 Week 7...

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