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Chemistry 7

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Amber Dowdy

on 16 October 2012

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Transcript of Chemistry 7

7.1 Ions How did Mendeleev organize
the elements? Later, scientists learned that elements
within each group behave similarly bc they have
the same # of valence electrons. valence electrons are the electrons in the highest
energy level, this determines the chemical properties How do you determine the # of
valence electrons? Valence electrons are usually the only electrons
used in chemical bonds. They are usually shown
in electron dot structures. Electron Dot structures show electrons as dots The Octet Rule ~ in forming compounds, atoms tend
to achieve stable electron dot configuration of a noble gas. An octet is a set of 8 ~ each noble gas has 8 electrons (except He) metals LOSE V.E. leaving a complete octet in next-lowest energy level. atoms of nonmetals GAIN V.E. tp achieve a complete octet. What is the charge of an atom? WHY? What happens if an atom LOSES a VE? It becomes + ~ WHY? **READ page 190 What happens if an atom GAINS an electron? *READ page 191 halide ion: produced when chlorine and other halogens
GAIN electrons, they have 7 valence electrons and only need
1 to achieve stable electron configuration.
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