Each Atom Wants 8 Valence Electrons Chlorine is similar to fluorine:(1s)2(2s)2(2p)6(3s)2(3p)5 Valence level is now 3,but number of valence electrons is still 7.So,the structure is: We can also make Cl2::cl·+.Ci:一：Ci:Ci: Same thing with Br2,12,and the other column VII elements: Br:Br:> which can be rewritten as:Br-Br: The purple line is a single bond,and it stands for 2 electrons If each atom has eight dots,then the molecule is stable V-6
Each Atom Wants 8 Valence Electrons Chlorine is similar to fluorine: (1s)2 (2s)2 (2p)6 (3s)2 (3p)5 Valence level is now 3, but number of valence electrons is still 7. So, the structure is: Cl We can also make Cl2: Cl + Cl Cl Cl Same thing with Br2, I2, and the other column VII elements: Br Br which can be rewritten as: Br Br The purple line is a single bond, and it stands for 2 electrons If each atom has eight dots, then the molecule is stable V-6
Multi-Element Molecules Oxygen:(1s)2(2s)2(2p)4-n=2;6 valence electrons: Fluorine we already know: (n =2;7 valence e) To put 8 electrons on each atom,we need two fluorines and one oxygen:F: :0-f: 。 :F: F: Note:The dot diagram tells us nothing about structure V-7
Multi-Element Molecules Oxygen: (1s)2 (2s)2 (2p)4 → n = 2; 6 valence electrons: O Fluorine we already know: F (n = 2; 7 valence e- ) To put 8 electrons on each atom, we need two fluorines and one oxygen: O F F O F F Note: The dot diagram tells us nothing about structure V-7