Notes #1: Chemical Bonds WCHS Chemistry **NEED YOUR PERIODIC TABLE OUT**

SOMETHING VERY SPECIAL FOR THIS UNIT! NEXT WEEK: 5 days → 4 mini-quizzes Notes/Quiz/Notes/Quiz etc...

CHEMICAL BOND Atoms join together chemically to become stable HOW? Electrons are transferred or shared to become a NEW chemical ONLY valence electrons are used in bonding

ONLY valence electrons are used in bonding Reminder: Valence electrons = the e- in the highest energy level 1s 2sp 3spd 4spdf

CIRCLE THE VALENCE ELECTRONS... Group #? 1s22s22p63s23p3 5 P _________________________ Mg _________________________ Ge _________________________ Cu _________________________ 2 1s22s22p63s2 1s22s22p63s23p64s23d104p2 4 1s22s22p63s23p64s23d9 d-block *The group # tells you the # of valence electrons!*

- + Electrostatic Attraction e- e-

OCTET RULE Stable when full!! Atoms will gain or lose electrons to obtain a full valence shell of 8 e’s. (except 1s) Stable when full!!

CIRCLE THE VALENCE ELECTRONS... 1s22s22p6 Ne0 _________________ Na0 _________________ Ar0 __________________ Cl0 __________________ 1s22s22p63s1 1s22s22p63s23p6 1s22s22p63s23p5 All atoms want a noble gas configuration!!

Stable Charge +1 +2 +3 +4 -3 -2 -1 Li - 1s22s1 N - 1s22s22p3 +2 +3 +4 -3 -2 -1 Li - 1s22s1 N - 1s22s22p3 Be - 1s22s2 O - 1s22s22p4 B - 1s22s22p1 F - 1s22s22p5 C - 1s22s22p2 Ne - 1s22s22p6