Lecture3SHWeb

Lecture3SHWeb - Monday Sept. 12, 2011 Todays Lecture 2.6...

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1 Monday Sept. 12, 2011 Today’s Lecture • 2.6 Atomic Structure • 2.7 Molecules and Ions • 2.8 The Periodic table • 2.9 Naming Compounds • 3.1 Atomic Masses Lecture 3
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2 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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3 – If atoms are made of the same components, why do different atoms have different chemical properties? • The chemical properties are due to the ______________ • different elements have have different __________________
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4 – Notation for atoms: • X = element symbol (Na, H, He, Li, Cl) • A = atomic mass number = # of protons + # of neutrons • Z = atomic number = # of protons = # of electrons in a neutral atom • A-Z is the # of neutrons – Example: X A Z Na 23 11 • ________________
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This note was uploaded on 09/25/2011 for the course CHEM 121 taught by Professor Leech during the Spring '11 term at Simon Fraser.

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Lecture3SHWeb - Monday Sept. 12, 2011 Todays Lecture 2.6...

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