Chem Chapter 2 Notes

Chem Chapter 2 Notes - C hapter 2 I. PERIODIC TABLE...

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Chapter 2 I. PERIODIC TABLE Hydrogen most abundant element on earth. Columns on the periodic table are called groups (numbered from 1A to 8A or 1 to 18) Rows in the periodic table: Periods Group 1A: Alkali Metals Group 2A: Alkaline Earth Metals Group 5A: Pnictogens Molecules=two or more atoms Molecules that contain two atoms are called Diatomic molecules Three atoms=triatomic molecules Diatomic Elements at STP (Standard Temperature & Pressure): -N 2 , O 2 , All the Halogens and H 2 Molecular Formulas: Gives the actual numbers and types of atoms in a molecule -Ex: H 2 O, CO 2 , CO, CH 4 , H 2 O 2 , O 2 , O 3 , and C 2 H 4 When an atoms or molecule loses electrons, it becomes positive charged: CATIONS. ” gains it become negatively charged: ANIONS. In general metals lose electrons: cation, nonmetals gain electrons: anion.
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Ionic compounds are generally combinations of metals and nonmetals
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This note was uploaded on 12/18/2010 for the course CHEM 1101 taught by Professor Crespen during the Spring '10 term at Aberystwyth University.

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Chem Chapter 2 Notes - C hapter 2 I. PERIODIC TABLE...

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