03 - An international network of university organizations...

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Information Session Sept 7 th Mon 5pm Goldwin Smith G76/Lewis An international network of university organizations that travel to developing countries to perform health care in needy communities. Come to the Info Session and learn about how you could travel to Honduras to provide necessary medical care to rural areas. For more info, contact [email protected] . Leadership positions available.
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Lecture 3: Review of lecture 2 Atoms: small nucleus ( ! 10 -4 Å dia.) contains ! 99.99 % of mass, surrounded by spherical, deformable “cloud” of electrons of 1 – 5 Å in diameter. Nucleus contains protons (+ charge) and neutrons (0 charge). #p + #n = mass # = A Neutral atom has zero charge: #p = #e = atomic # = Z Chemical behavior primarily determined by Z , but most elements have isotopes – same Z but different #n (and A). Usually #n ! #p. Except for radioactive species the relative abundance of isotopes is fixed. Count atoms in moles (6.022 x 10
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03 - An international network of university organizations...

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