1/30/18.docx - Nina Addante Biology Downer Chemistry Basics...

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Nina Addante Biology Downer 1/30/18 Chemistry Basics Continued… Arrangement of Electrons Electrons are constantly moving Useful to construct models of atoms with energy levels or electron shells Each shell contains a certain number of electrons 2 electrons fill the first shell 8 electrons fill each additional shell “Valence” shell is the outermost shell Atoms can give up, accept, or share electrons to fill their outer shell… they “want” the outer shell filled Chemical properties of atoms are determined by arrangement of their electrons Electron Configurations and Properties Unstable and Reactive Hydrogen, Carbon, Sodium Outermost shells are unfilled Stable and Unreactive Helium, Neon, Argon Outermost shells are filled Ionic Bonds The attraction of opposite charges holds atoms together Involve the transfer of one or more electrons from one atoms to another Because electrons are negatively charged, the atoms that receive electrons are negatively charged and the atoms that donates are positively charged. Ionic bonds are
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