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Chemistry Lecture Notes - September 1, 2006

Chemistry Lecture Notes - September 1, 2006 - September 1...

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September 1, 2006 Chemistry Lecture Notes Monoatomic – single atom Noble gases are the only substances which exist as single atom gases Molecule – two atoms or more in a definite arrangement held together by chemical bonds Some molecules make up elements Cl2 S8 Some molecules make up compounds H20 CH4 Diatomic molecules – made up of two atoms Monotomic, diatomic only Examples of elements which are made up of diatomic nolecules: HOFBrINCl (KNOW THESE) Ions – a charged species formed from a neutral atom or molecule when electron are gained or lost. Cation – positive charged ion (lose electrons, more protons than there are electrons) Formed by electrons being lost Anion – negative charged ion (gain electrons) Formed by electrons being gained Ionic compound – a neutral compound formed from cations and anions Monoatomic ion – an ion made of one atom Example – Cl- Fe3+ Iron – 26 protons. Fe3+ = 23 protons
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