Exception And Failure Rule Octet

Exception And Failure Rule Octet Although the octet rule helps a lot in predicting chemical formulas simple binary compounds, but it turns out that many of these rules are violated and failed to predict the chemical formulas of compounds of transition elements and posttransition. Exception Rule Octet Exception rule octet can shared in three group as following. 1. Compound Which No reach rule octet. Compound Which atom the center have electron valence not enough from 4 included in this group. This led to after all electron its valence paired still Not yet reach octet. For exampleis BeCl 2 , BCl 3 , And AlBr 3 . .. .. .C _. l B .. ._ C .l (atom B is not an octet yet) .. ._ C .l .. .. 2. Compound with amount electron valence odd. For example is NO 2 , Which have electron valence (5 + 6 + 6) = 17. Possibility formula Lewis For NO 2 as following. O .N O 3. Compound Which surpass rule octet. This happen on elements period 3 or more Which can accommodate more from 8 electron on skin the outermost (remember, skin m can accommodate until 18 electron). A number of example is PCl 5 , SF6 , _ CLF 3 , IF 7 , And SbCl 5 . Pay attention to the formula Lewis from PCl 5 , SF 6 , and ClF 3 following This. F F.. .. .. Cl F F.. .. F .. S F .. .. F .. .. C._ .l .. C.. l .. P Cl .. .. .. .. Cl .. F .. F .. Cl .. .. A. .. PCl 5 B. SF 6 ClF 3 Failure Rule Octet The octet rule fails to predict the chemical formulas of compounds of transition elementsnor posttransition. Element posttransition is element metal after element transition, for example No, sn, And Ms. Sn have 4 electron valence, but the compound more with an oxidation state of +2. Likewise, Bi has 5 valence electrons, but there are more compounds with an oxidation state of +1 And +3. On generally, element transition nor element posttransition No fulfil rule octet. Bond Metal Bond electrons valence in atom metal it's not bond ion, Also No bond covalent simple. Something metal consists from something lattice strict from ion- positive ions and around them there is a sea (atmosphere) of valence electrons. These valence electrons are confined to certain energy surfaces, however have Enough freedom, so that electrons This No continously used together by two ion Which The same. When given energy, electrons it is easily passed from atom to atom. This bonding system is unique to metals and known as bond metal . Task 1 1. is Which intended with bond covalent? 2. Determine type bond on compound following This, classified bond ion or bond covalent. a. HCl f. Ag 2 O b. H 2 SO 4 g. FeS c. K 2 O h. Ca(NO 3 ) 2 d. H 2 CO 3 i. Chapter 2 e. CH 3 Cl j. C 6 H 12 O 6 3. Draw it with structure Lewis happen bond covalent following And mentiontype bond covalent single or double. a. Cl 2 (number Cl atom = 17) f. CS 2 (number atom C = 6, S = 16) b. F 2 (number F atom = 9) g. C 2 H 2 (atomic no C = 6, H = 1) c. CH 4 (atomic number C = 6, H = 1) h. C 2 H 4 (number C atom = 6, H = 1) d. H 2 S (no atom H = 1, S = 16) i. C 2 H 6 (number C atom = 6, H = 1) e. CCl 4 (number C atom = 6, Cl = 17) j. PCl 3 (atomic no P = 15, Cl = 17) 4. Name it privilege atom carbon! 5. Explain difference between compound covalent polar with covalent nonpolar! 6. Name it example compound polar And nonpolar! 7. Why happen failure law octet? Name it example compound Which including failure law octet! 8. Explain happen bond metal! 9. Why metal can deliver hot And electricity? 10.Why metal own point melt And point boiling tall?