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LESSON 12

• the nucleus is represented by the atomic symbol
• for individual elements it determines the number of valence electrons
• electrons are represented by the dots around the symbol
• 4 orbitals (one on each side of the nucleus) each holding a max. of 2 electrons
• each orbital get 1 electron before they pair up

• in covalent compounds electrons are shared

1. determine the # of valence electrons for each atom in the molecule
2. place atoms so that the valence electrons are shared to fill each orbital

 

• sometimes the only way covalent compounds can fill all their valence level is if they share more than one electron

• in ionic compounds electrons transfer from 1 element to another 
• determine the number of valence on the cation. move these to the anion 
• draw [   ] around the metal and non - metal 
• write the charges outside the brackets 

-Sherilyn

posted by chemistry11 @ 1:22 AM