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# Effective Aatomic Number

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# Effective Aatomic Number

Dharmendra semester 1

Dharmendra semester 1

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### Effective Aatomic Number

1. 1. 2020-2021 A SMINAR PRAJENTED BAY - DHARMENDRA SEM.- 1st S. P. C. GOVT COLLEGE AJMER TOPIC- EFFECTIVE ATOMIC NUMBER AND 18 ELECTRON RUAL
2. 2. Effective Atomic Number A/C To Sidgwick When ‘CO, Molecules Donate l.p of Electrones to metal Atome or ion the totel number of Electrones on the central Atom. Including Accepting Electrones from ‘CO, molecules is called Effective Atomic number of Metal Atom.It in many cases ‘ EAN, is equal to the Atomic Number of Sidgwick And have shown the Following Formula
3. 3. E.A.N (G)= Xm+2Y/ x = x-1 Where x= no. Of metal atom y= no.of’ CO, MOLECULES M= ATOMIC NO. OF METAL G= ATOMIC NO. OF NEXT INERT GASE For mononuculer carbonyl’ x , = 1 e.a.n= G= m+2y
4. 4. Examples:_ 1. Ni(co)4 For ‘ni, m=28 y= 4 E.A.N= 28 + 2×4=36 (kr)
5. 5. Example:_2. FE(CO)5 For ‘ Fe, Atom M= 26 y=5 E.A.n=26+2×5=36
6. 6. E.A.n for polynuclear carbonyl Ex:_ mn2(Co)10 Electrons from 2 mn Atoms = 2×25 = 50 es. Electrones from 10 ‘ Co, Molecules = 2× 10 = 20 es. Electrones from 1 mn-mn Bond = 1×2=2 es. Totel Electrones = 72 Electrones
7. 7. Example:_2 . FE3(CO)12 Electrons from 3 ‘fe, Atoms = 3×26= 78 Electrones from 12 ‘ CO,ATOMS = 2×12=24 Electrones from 3 ‘ fe, Bond = 3×2= 6 totel Electrones = 108 E.a.n of fe = 108/3= 36 (kr)
8. 8. 18 Electrones Rule A/c to this rule sum no. Of outer shell Electrones the metal atom and no. Of electrons donated by ‘ Co, Molecules is equal to = 18 1. ex_1. Ni (co)4 For Ni 3d84s2 = 10 electrones 1. ‘CO, ele. 2×4=8 electrones Totel = 18 elec.
9. 9. Example – 2 fe(co)5 for fe = 3d64s2 =8 For ‘ Co, ele.= 2×5= 10 totel = 18 Electrones
10. 10. Thank you……