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Electron Configurations Atomic Properties and the Periodic Table Subshells within a shell are at the same energy level in hydrogen 2s 2p Orbital Energy Diagrams Subshells are split in a multielectron atom 2s 2p than in the hydrogen atom Orbital energies are lower in a multielectron atom Prentice Hall 2005 General Chemistry 4th edition Hill Petrucci McCreary Perry Chapter Eight Prentice Hall 2005 General Chemistry 4th edition Hill Petrucci McCreary Perry Chapter Eight 3 4 Electron Configurations An electron configuration describes the distribution of electrons among the various orbitals in the atom Electron configuration is represented in two ways The spdf notation uses numbers to designate a principal shell and letters s p d f to identify a subshell a superscript indicates the number of electrons in a designated subshell Prentice Hall 2005 General Chemistry 4th edition Hill Petrucci McCreary Perry Electron Configurations In an orbital box diagram a box represents each orbital within subshells and arrows represent electrons The arrows Continue to download »
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General Chemistry 4th edition, Hill, Petrucci, McCreary, Perry. Chapter Nine. 1. Chemical Bonds. Chapter Nine. Prentice Hall © 2005 Chapter Nine Chemical Bonds Chemical Bonds A Preview Forces called chemical bonds hold atoms together in molecules and keep ions in place in solid ionic compounds Chemical bonds are electrostatic forces they reflect a balance in the forces of attraction and repulsion between electrically charged particles Prentice Hall 2005 General Chemistry 4th edition Hill Petrucci McCreary Perry Chapter Nine Prentice Hall 2005 General Chemistry 4th edition Hill Petrucci McCreary Perry Chapter Nine Electrostatic Attractions and Repulsions Nuclei attract electron s 3 4 Energy of Interaction Nuclei repel other nuclei Electrons repel other electrons At 74 pm attractive forces are at a maximum energy is at a minimum Hydrogen nuclei far apart just a little attraction Both attractions and repulsions occur what s the net effect Answer it depends on the distance between nuclei Chapter Nine Closer than 74 pm repulsion 
WWW GUARDIAN MOBILE COM INTRODUCTION 2 INSTALLATION 4 CONFIGURATION 5 PURCHASE AND REGISTRATION 9 Last Document Update 8 Sep 2008 1 WWW GUARDIAN MOBILE COM INTRODUCTION Guardian is an anti theft software for mobile phone easy efficient and very effective Every time the phone is powered up Guardian check if the SIM card is authorized if not Guardian will send a notification sms invisible to the previously selected number containing the number of the new inserted sim card COMPATIBILITY LIST Nokia 3250 5320 5500 5700 6110 6120 6121 6124 6210 6220 6290 6650 E50 E51 E60 E61 E61i E62 E65 E66 E70 E71 E90 N71 N73 N75 N76 N77 N78 N79 N80 N81 N81 8Gb N82 N85 N91 N92 N93 N93i N95 N95 8Gb N96 LG KS10 KT610 Samsung SGH i400 SGH i450 SGH i520 SGH i550 SGH i560 SGH G810 SGH L870 INNOV8 i8510 And next month the compatibility will be extended to include also these UIQ 3 x devices Ericsson M600 P990 W950 P1 W960i G700 G900 
Installing Apache PHP and MySQL PHP and MySQL are usually associated with LAMP Linux Apache MySQL PHP However most PHP developer including me are actually using Windows when developing the PHP application So this page will only cover the WAMP Windows Apache MySQL PHP You will learn how to install Apache PHP and MySQL under Windows platform The first step is to download the packages Apache www apache org PHP www php net MySQL www mysql com You should get the latest version of each packages As for the example in this tutorial i m using Apache 2 0 50 apache 2 0 50 win32 x86 no ssl msi PHP 4 3 10 php 4 3 10 Win32 zip and MySQL 4 0 18 mysql 4 0 18 win zip Installing Apache Installing apache is easy if you download the Microsoft Installer msi package Just double click on the icon to run the installation wizard Click next until you see the Server Information window You can enter localhost for both the Network Domain and Server Name As for the administrator s email address you can enter anything you want I m using 
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