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lecture3 - Monday Sept 8 2003 Todays Lecture 2.6 Atomic...

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Monday Sept. 8, 2003 Today’s Lecture 2.6 Atomic Structure 2.7 Molecules and Ions 2.8 The Periodic table 2.9 Naming Compounds
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Modern View of Atomic Structure: – Chemist perspective: an important feature of an atom is its electrons since they dictate the chemical properties of an element – Simple view of an atom: small nucleus ~ 10 -13 cm in diameter electron cloud 10 -8 cm across – Atoms are made of: Mass Charge electrons 9.11 x 10 -31 kg -1 protons 1.67 x 10 -27 kg +1 neutrons 1.67 x 10 -27 kg 0 nucleus is very small and very dense
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– If atoms are made of the same components, why do different atoms have different chemical properties? The chemical properties are due to the # and arrangement of electrons different elements have have different # of p and e - different chemical properties
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