BSC 2010C Lecture Notes - Lecture 7: Heat Capacity, Sodium Chloride, Covalent Bond

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Chapter 2: atoms and molecules: they are isotopes of each other. Individuals atoms join together to form molecules: only the outer electron shells are involved, valence electrons: in outermost (valence) shell. Determine chemical behavior of atoms: valence number: # of unpaired electrons in valence shell. Valence # determines # of bonds an atom can form. Valence electrons: oxygen has 8 electrons, 2 in 1st shell, 6 in 2nd shell (valence) but 2 unpaired, oxygen"s valence number is 2, oxygen can form 2 bonds. What"s an electrons orbital: 3-d space where electrons are found 90% of time. Orbitals: each orbital: fits up to 2 electrons, all together: total of 5 orbitals in 1st amd 2nd shells, fits 10 electrons, 5 times 2 equals 10. Molecule: 2 or ore atoms held together by chemical bonds. Compound: specifically 2 or more different kinds of atoms held together by chemical bonds.

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