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# IB Chemistry on Quantum Numbers, Electronic Configuration and De Broglie Wavelength

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IB Chemistry on Quantum Numbers, Electronic Configuration and De Broglie Wavelength

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### IB Chemistry on Quantum Numbers, Electronic Configuration and De Broglie Wavelength

1. 1. Tutorial on Quantum Number, Electronic Configuration and De Broglie Wavelength. Prepared by Lawrence Kok http://lawrencekok.blogspot.com
2. 2. How electrons move? • • Bohr Model Electron as particle Electron orbit in FIXED radius from nucleus Electron – particle Orbit Bohr Model equation: • Angular momentum, L = nh/2π L= nh 2p mvr = nh 2p
3. 3. How electrons move? • • Bohr Model Electron as particle Electron orbit in FIXED radius from nucleus • • • Quantum Model Electron as standing wave around nucleus Electron NOT in fixed position ORBITAL – probability/chance finding electron Electron – particle Electron – Wave like nature Orbit Orbital Bohr Model equation: • Angular momentum, L = nh/2π L= nh 2p mvr = nh 2p De Broglie wavelength equation • Electron -standing wave. • E = mv2 and E = hf -> λ = h/mv mv 2 = hf mv 2 = h v l Click here - electron wave mv = h l mv = h l
4. 4. How electrons move? • • Bohr Model Electron as particle Electron orbit in FIXED radius from nucleus • • • Quantum Model Electron as standing wave around nucleus Electron NOT in fixed position ORBITAL – probability/chance finding electron Electron – particle Electron – Wave like nature Orbit Orbital De Broglie wavelength equation • Electron -standing wave. • E = mv2 and E = hf -> λ = h/mv Bohr Model equation: • Angular momentum, L = nh/2π L= nh 2p mvr = nh 2p mv 2 = hf mv 2 = h v l Click here - electron wave mv = h l mv = h l Combine Bohr and De Broglie mvr = nh 2p h l r= nh 2p nl = 2p r nλ = 2πr What does, nλ = 2πr means ? • • • • Orbit/circumference - exact multiples of electron wavelength Circumference of orbit- equal t0 1x wavelength, 2x wavelength, 3x wavelength or multiple of its wavelength, nλ Electron as standing wave around the nucleus Wavelength fits around the circumference of the orbit
5. 5. Electron Wavelength around orbit • • • • Electron acts as standing wave surrounding the nucleus Wavelength fits around the circumference of the orbit Orbit/circumference - exact multiples of electron wavelength Circumference of orbit- equal the wavelength, 2x wavelength, 3x wavelength or multiple of its wavelength, nλ nλ = 2πr n=1 1λ = 2πr1 ONE wavelength λ fits the 1st orbit n=2 2λ = 2πr2 TWO wavelength λ fits the 2nd orbit n=3 3λ = 2πr3 THREE wavelength λ fits the 3rd orbit
6. 6. Electron Wavelength around orbit • • • • Electron acts as standing wave surrounding the nucleus Wavelength fits around the circumference of the orbit Orbit/circumference - exact multiples of electron wavelength Circumference of orbit- equal the wavelength, 2x wavelength, 3x wavelength or multiple of its wavelength, nλ nλ = 2πr n=1 1λ = 2πr1 ONE wavelength λ fits the 1st orbit n=2 2λ = 2πr2 TWO wavelength λ fits the 2nd orbit n=3 3λ = 2πr3 THREE wavelength λ fits the 3rd orbit Standing wave around the circumference /circle 1λ ONE wavelength λ fits the 1st orbit 1st Orbit 2λ TWO wavelength λ fits the 2nd orbit 3λ 2nd Orbit THREE wavelength λ fits the 3rd orbit 3rd Orbit
7. 7. Electron Wavelength around orbit • • • • Electron acts as standing wave surrounding the nucleus Wavelength fits around the circumference of the orbit Orbit/circumference - exact multiples of electron wavelength Circumference of orbit- equal the wavelength, 2x wavelength, 3x wavelength or multiple of its wavelength, nλ nλ = 2πr n=1 1λ = 2πr1 ONE wavelength λ fits the 1st orbit n=2 2λ = 2πr2 TWO wavelength λ fits the 2nd orbit n=3 3λ = 2πr3 THREE wavelength λ fits the 3rd orbit Standing wave around the circumference /circle 1λ ONE wavelength λ fits the 1st orbit 1st Orbit 2λ TWO wavelength λ fits the 2nd orbit 3λ 2nd Orbit THREE wavelength λ fits the 3rd orbit 3rd Orbit Relationship between wavelength and circumference a o = 0.0529nm/Bohr radius 1λ n=1 n=2 ONE wavelength λ TWO wavelength λ r n = n2 a 0 1λ1 = 2πr1 2λ 2λ2 = 2πr2 λ1 = 6.3 ao - 1st orbit r n = n2 a 0 λ2= 12.6 ao - 2nd orbit 3λ n=3 THREE wavelength λ 3λ3 = 2πr3 r n = n2 a 0 λ3 = 18.9 ao - 3rd orbit
8. 8. Electron Wavelength around orbit • • • • Electron acts as standing wave around the nucleus Wavelength fits around circumference of orbit Orbit/circumference - exact multiples of electron wavelength Circumference of orbit- equal t0 1x wavelength, 2x wavelength, 3x wavelength or multiple of its wavelength, nλ nλ = 2πr ONE wavelength λ fits the 1st orbit n=1 λ = 2πr1 n=2 2λ = 2πr2 TWO wavelength λ fits the 2nd orbit n=3 3λ = 2πr3 THREE wavelength λ fits the 3rd orbit Standing wave around the circumference /circle λ ONE wavelength λ fits the 1st orbit 1st Orbit λ TWO wavelength λ fits the 2nd orbit λ 2nd Orbit THREE wavelength λ fits the 3rd orbit Click here to view video Click here to view notes Click here - electron wave simulation
9. 9. Models for electronic orbitals 1913 1925 Bohr Model De Broglie wavelength Electron in fixed orbits Electron form a standing wave 1927 Heisenberg Uncertainty principle
10. 10. Models for electronic orbitals 1913 Bohr Model 1927 1925 De Broglie wavelength Electron in fixed orbits Electron form a standing wave Heisenberg Uncertainty principle • • Impossible to determine both the position and velocity of electron at the same time. Applies to electron, small and moving fast.. Probability/chance/likelyhood to find electron in space ORBITAL is used to replace orbit Δx = uncertainty in position Δp = uncertainty in momentum/velocity (ħ)= reduced plank constant
11. 11. Models for electronic orbitals 1927 1913 1925 Bohr Model De Broglie wavelength Electron in fixed orbits Heisenberg Uncertainty principle • Electron form a standing wave • Impossible to determine both the position and velocity of electron at the same time. Applies to electron, small and moving fast.. If we know position, x very precisely – we don’t know its momentum, velocity Δp  electron Δx Big hole electron Δx  electron Probability/chance/likelyhood to find electron in space Δx  ORBITAL is used to replace orbit Small hole Reduce the hole smaller, x  Know precisely x, electron position  Uncertainty Δx is small ( Δx, Δp)  Δp is high so Δx Δp > h/2  Δp high – uncertainty in its velocity is high Position of electron is unknown! Δp = mass x velocity Velocity is unknown Δx = uncertainty in position Δp = uncertainty in momentum/velocity (ħ)= reduced plank constant Probability/likelyhood to find an electron in space
12. 12. Uncertainty for electron in space 1913 Bohr Model 1927 1925 De Broglie wavelength Electron in fixed orbits Electron form a standing wave Heisenberg Uncertainty principle • • Impossible to determine both the position and velocity of electron at the same time. Applies to electron, small and moving fast.. If we know position, x very precisely – we don’t know its momentum, velocity Probability/chance/likelyhood to find an electron ORBITAL is used to replace orbit Excellent video on uncertainty principle Click here video on uncertainty principle Video on uncertainty principle Click here to view uncertainty principle Δx = uncertainty in position Δp = uncertainty in momentum/velocity (ħ)= reduced plank constant
13. 13. Schrödinger's wave function. 1927
14. 14. Schrödinger's wave function. 1927 • • Schrödinger's wave function. Mathematical description of electron given by wave function Amplitude – probability of finding electron at any point in space/time High probability finding electron electron density • • • Probability finding electron in space Position electron unknown Orbital ✔ NOT orbit ✗ used is • • • Probability find electron distance from nucleus Probability density used- Ψ2 Orbital NOT orbit is used ORBITAL is used to replace orbit ORBITAL• Mathematical description wavelike nature electron • Wavefunction symbol – Ψ • Probability finding electron in space
15. 15. Schrödinger's wave function. 1927 • • Schrödinger's wave function. Mathematical description of electron given by wave function Amplitude – probability of finding electron at any point in space/time High probability finding electron electron density • • • Bohr Model ✗ • • • Probability finding electron in space Position electron unknown Orbital ✔ NOT orbit ✗ used is Schrödinger's wave function. Probability find electron distance from nucleus Probability density used- Ψ2 Orbital NOT orbit is used ✔ ORBITAL is used to replace orbit ORBITAL• Mathematical description wavelike nature electron • Wavefunction symbol – Ψ • Probability finding electron in space better description electron behave Click here to view simulation
16. 16. Schrödinger's wave function. 1927 • • Schrödinger's wave function. Mathematical description of electron given by wave function Amplitude – probability of finding electron at any point in space/time High probability finding electron electron density • • • Bohr Model ✗ • • • Probability finding electron in space Position electron unknown Orbital ✔ NOT orbit ✗ used is Schrödinger's wave function. Probability find electron distance from nucleus Probability density used- Ψ2 Orbital NOT orbit is used ✔ ORBITAL is used to replace orbit ORBITAL• Mathematical description wavelike nature electron • Wavefunction symbol – Ψ • Probability finding electron in space better description electron behave Click here to view simulation Click here to view simulation Click here to view simulation
17. 17. Four Quantum Numbers • • • 1 Electrons arrange in specific energy level and sublevels Orbitals of electrons in atom differ in size, shape and orientation. Allow states call orbitals, given by four quantum number 'n', 'l', 'ml' and ’ms’ - (n, l, ml, ms) Principal Quantum Number (n): n = 1, 2, 3,.. ∞ • Energy of electron and size of orbital/shell • Distance from nucleus, (higher n – higher energy) • Larger n - farther e from nucleus – larger size orbital • n=1, 1stprincipal shell ( innermost/ground shell state) No TWO electron have same 4 quantum number
18. 18. Four Quantum Numbers • • • Electrons arrange in specific energy level and sublevels Orbitals of electrons in atom differ in size, shape and orientation. Allow states call orbitals, given by four quantum number 'n', 'l', 'ml' and ’ms’ - (n, l, ml, ms) 1 Principal Quantum Number (n): n = 1, 2, 3,.. ∞ • Energy of electron and size of orbital/shell • Distance from nucleus, (higher n – higher energy) • Larger n - farther e from nucleus – larger size orbital • n=1, 1stprincipal shell ( innermost/ground shell state) 2 Angular Momentum Quantum Number (l): l = 0 to n-1. • Orbital Shape • Divides shells into subshells/sublevels. • Letters (s, d, p, f) s orbital p orbital d orbital No TWO electron have same 4 quantum number
19. 19. Four Quantum Numbers • • • Electrons arrange in specific energy level and sublevels Orbitals of electrons in atom differ in size, shape and orientation. Allow states call orbitals, given by four quantum number 'n', 'l', 'ml' and ’ms’ - (n, l, ml, ms) 1 Principal Quantum Number (n): n = 1, 2, 3,.. ∞ • Energy of electron and size of orbital/shell • Distance from nucleus, (higher n – higher energy) • Larger n - farther e from nucleus – larger size orbital • n=1, 1stprincipal shell ( innermost/ground shell state) 2 Angular Momentum Quantum Number (l): l = 0 to n-1. • Orbital Shape • Divides shells into subshells/sublevels. • Letters (s, d, p, f) s orbital p orbital d orbital 3 No TWO electron have same 4 quantum number Magnetic Quantum Number (ml): ml = -l, 0, +l. • Orientation orbital in space/direction • mℓ range from −ℓ to ℓ, • ℓ = 0 -> mℓ = 0 –> s sublevel -> 1 orbital • ℓ = 1 -> mℓ = -1, 0, +1 -> p sublevel -> 3 diff p orbitals • ℓ = 2 -> mℓ = -2, -1, 0, +1, +2 -> d sublevel -> 5 diff d orbitals • (2l+ 1 ) quantum number for each ℓ value
20. 20. Four Quantum Numbers • • • Electrons arrange in specific energy level and sublevels Orbitals of electrons in atom differ in size, shape and orientation. Allow states call orbitals, given by four quantum number 'n', 'l', 'ml' and ’ms’ - (n, l, ml, ms) 1 Principal Quantum Number (n): n = 1, 2, 3,.. ∞ • Energy of electron and size of orbital/shell • Distance from nucleus, (higher n – higher energy) • Larger n - farther e from nucleus – larger size orbital • n=1, 1stprincipal shell ( innermost/ground shell state) 2 Angular Momentum Quantum Number (l): l = 0 to n-1. • Orbital Shape • Divides shells into subshells/sublevels. • Letters (s, d, p, f) s orbital p orbital 3 4 No TWO electron have same 4 quantum number Magnetic Quantum Number (ml): ml = -l, 0, +l. • Orientation orbital in space/direction • mℓ range from −ℓ to ℓ, • ℓ = 0 -> mℓ = 0 –> s sublevel -> 1 orbital • ℓ = 1 -> mℓ = -1, 0, +1 -> p sublevel -> 3 diff p orbitals • ℓ = 2 -> mℓ = -2, -1, 0, +1, +2 -> d sublevel -> 5 diff d orbitals • (2l+ 1 ) quantum number for each ℓ value Spin Quantum Number (ms): ms = +1/2 or -1/2 • Each orbital – 2 electrons, spin up/down • Pair electron spin opposite direction • One spin up, ms = +1/2 • One spin down, ms = -1/2 • No net spin/cancel out each other– diamagnetic electron writing electron spin electron spin up/down d orbital
21. 21. Principal and Angular Momentum Quantum numbers • • • Electrons arrange in specific energy level and sublevels Orbitals of electrons in atom differ in size, shape and orientation. Allow states call orbitals, given by four quantum number 'n', 'l', 'ml' and ’ms’ - (n, l, ml, ms) 1 Principal Quantum Number (n): n = 1, 2, 3, …, ∞ • Energy of electron and size of orbital /shell • Distance from nucleus, (higher n – higher energy) • Larger n - farther e from nucleus – larger size orbital • n=1, 1stprincipal shell ( innermost/ground shell state) 2 Angular Momentum Quantum Number (l): l = 0, ..., n-1. • Orbital Shape • Divides shells into subshells (sublevels) • Letters (s,p,d,f) • < less than n-1 Sublevels, l
22. 22. Principal and Angular Momentum Quantum numbers • • • Electrons arrange in specific energy level and sublevels Orbitals of electrons in atom differ in size, shape and orientation. Allow states call orbitals, given by four quantum number 'n', 'l', 'ml' and ’ms’ - (n, l, ml, ms) 1 Principal Quantum Number (n): n = 1, 2, 3, …, ∞ • Energy of electron and size of orbital /shell • Distance from nucleus, (higher n – higher energy) • Larger n - farther e from nucleus – larger size orbital • n=1, 1stprincipal shell ( innermost/ground shell state) 2 Angular Momentum Quantum Number (l): l = 0, ..., n-1. • Orbital Shape • Divides shells into subshells (sublevels) • Letters (s,p,d,f) • < less than n-1 Sublevels, l Quantum number, n and l l=1 2p sublevel l=0 2s sublevel n= 2 n= 1 1 Principal Quantum #, n (Size , energy) l=0 2 1s sublevel Angular momentum quantum number, l (Shape of orbital) 1 Principal Quantum Number (n) 2 Angular Momentum Quantum Number (l)
23. 23. Principal and Angular Momentum Quantum numbers • • • Electrons arrange in specific energy level and sublevels Orbitals of electrons in atom differ in size, shape and orientation. Allow states call orbitals, given by four quantum number 'n', 'l', 'ml' and ’ms’ - (n, l, ml, ms) 1 Principal Quantum Number (n): n = 1, 2, 3, …, ∞ • Energy of electron and size of orbital /shell • Distance from nucleus, (higher n – higher energy) • Larger n - farther e from nucleus – larger size orbital • n=1, 1stprincipal shell ( innermost/ground shell state) 2 Angular Momentum Quantum Number (l): l = 0, ..., n-1. • Orbital Shape • Divides shells into subshells (sublevels) • Letters (s,p,d,f) • < less than n-1 Sublevels, l Quantum number, n and l l=1 2p sublevel l=0 2s sublevel n= 2 n= 1 1 Principal Quantum #, n (Size , energy) l=0 2 1s sublevel Angular momentum quantum number, l (Shape of orbital) 2p sublevel – contain 2p orbital 2nd energy level Has TWO sublevels 2s sublevel – contain 2s orbital 1st energy level Has ONE sublevel 1s sublevel – contain 1s orbital 1 Principal Quantum Number (n) 2 Angular Momentum Quantum Number (l)
24. 24. Electronic Orbitals n = 1, 2, 3,…. Allowed values Energy Level n= 3 n= 2 n= 1 1 Principal Quantum #, n (Size , energy)
25. 25. Electronic Orbitals n = 1, 2, 3,…. Allowed values l = 0 to n-1 l=2 3d sublevel l=1 3p sublevel l=0 3s sublevel l=1 2p sublevel l=0 2s sublevel l=0 1s sublevel Energy Level n= 3 n= 2 n= 1 1 Principal Quantum #, n (Size , energy) 2 Angular momentum quantum number, l (Shape of orbital)
26. 26. Electronic Orbitals n = 1, 2, 3,…. Allowed values l = 0 to n-1 Allowed values ml = -l, 0, +l- (2l+ 1 ) for each ℓ value ml =+2 ml =+1 ml = 0 l=1 3px orbital ml = 0 3s sublevel 3py orbital 3s orbital ml =+1 l=0 3pz orbital ml = 0 3p sublevel 3dxy orbital ml =-1 l=1 3dxz orbital ml =+1 n= 3 3dz2 orbital ml =-2 3d sublevel 3dyz orbital ml =-1 l=2 Energy Level 3dx2 – y2 orbital 2py orbital ml = 0 2p sublevel 2pz orbital ml =-1 n= 2 2px orbital l=0 1 Principal Quantum #, n (Size , energy) 2 ml =0 2s orbital l=0 n= 1 2s sublevel 1s sublevel ml =0 1s orbital Angular momentum quantum number, l (Shape of orbital) 3 Magnetic Quantum Number (ml) (Orientation orbital)
27. 27. Electronic Orbitals Simulation Electronic Orbitals n = 1, 2, 3,…. Allowed values l = 0 to n-1 Allowed values ml = -l, 0, +l- (2l+ 1 ) for each ℓ value ml =+2 ml =+1 ml = 0 l=1 3px orbital ml = 0 3s sublevel 3py orbital 3s orbital ml =+1 l=0 3pz orbital ml = 0 3p sublevel 3dxy orbital ml =-1 l=1 3dxz orbital ml =+1 n= 3 3dz2 orbital ml =-2 3d sublevel 3dyz orbital ml =-1 l=2 Energy Level 3dx2 – y2 orbital 2py orbital ml = 0 2p sublevel 2pz orbital ml =-1 n= 2 2px orbital l=0 1 Principal Quantum #, n (Size , energy) 2 2s sublevel ml =0 1s sublevel ml =0 Click here to view simulation 2s orbital l=0 n= 1 Click here to view simulation 1s orbital Angular momentum quantum number, l (Shape of orbital) 3 Magnetic Quantum Number (ml) (Orientation orbital) Click here to view simulation
28. 28. Quantum Numbers and Electronic Orbitals Energy Level n= 3 n= 2 n= 1
29. 29. Quantum Numbers and Electronic Orbitals Energy Level l=2 3d sublevel l=1 3p sublevel l=0 3s sublevel l=1 2p sublevel l=0 2s sublevel l=0 1s sublevel n= 3 n= 2 n= 1
30. 30. Quantum Numbers and Electronic Orbitals ml =+2 Energy Level 3dx2 – y2orbital ml =+1 3dz2 orbital 3dxz orbital ml =-2 3d sublevel ml = 0 ml =-1 l=2 3dyz orbital 3dxy orbital n= 3 ml =+1 l=1 3s sublevel 2p sublevel n= 2 3pz orbital 3px orbital ml = 0 3s orbital ml =+1 l=0 3p sublevel ml = 0 ml =-1 l=1 3py orbital 2py orbital ml = 0 2pz orbital ml =-1 2px orbital l=0 n= 1 2s sublevel ml =0 2s orbital l=0 1s sublevel ml =0 1s orbital
31. 31. Quantum Numbers and Electronic Orbitals ml =+2 3dx2 – y2orbital Simulation Electronic Orbitals Energy Level ml =+1 3d sublevel ml = 0 3dz2 orbital ml =-1 l=2 3dyz orbital 3dxz orbital Click here to view simulation n= 3 ml =-2 3dxy orbital ml =+1 3p sublevel ml = 0 3pz orbital ml =-1 l=1 3py orbital 3px orbital Click here to view simulation l=0 2p sublevel n= 2 ml = 0 3s orbital ml =+1 l=1 3s sublevel 2py orbital ml = 0 2pz orbital ml =-1 2px orbital l=0 n= 1 2s sublevel ml =0 2s orbital l=0 1s sublevel ml =0 1s orbital Click here to view simulation
32. 32. Concept Map Quantum number No TWO electron have same 4 quantum number Quantum number = genetic code for electron Electron has special number codes
33. 33. Concept Map No TWO electron have same 4 quantum number Quantum number Quantum number = genetic code for electron What are these 4 numbers? (1, 0, 0, +1/2) 0r (3, 1, 1, +1/2) 4 numbers n l Size/distance Shape Number + letter ml Orientation ms Electron spin Electron has special number codes
34. 34. Concept Map No TWO electron have same 4 quantum number Quantum number Quantum number = genetic code for electron What are these 4 numbers? (1, 0, 0, +1/2) 0r (3, 1, 1, +1/2) 4 numbers n l Size/distance Shape ml Orientation Number + letter 1 Electron with quantum number given below (n,l,ml,,ms) – (1, 0, 0, +1/2) 1s orbital ms Electron spin Electron has special number codes
35. 35. Concept Map No TWO electron have same 4 quantum number Quantum number Quantum number = genetic code for electron What are these 4 numbers? (1, 0, 0, +1/2) 0r (3, 1, 1, +1/2) 4 numbers n l Size/distance Shape ml Orientation Number + letter 1 Electron with quantum number given below (n,l,ml,,ms) – (1, 0, 0, +1/2) 1s orbital (n,l,ml,,ms) – (3, 1, 1, +1/2) 3py orbital ms Electron spin Electron has special number codes
36. 36. Concept Map No TWO electron have same 4 quantum number Quantum number Quantum number = genetic code for electron What are these 4 numbers? (1, 0, 0, +1/2) 0r (3, 1, 1, +1/2) 4 numbers n l Size/distance Shape ml Orientation ms Electron has special number codes Electron spin Number + letter 1 Electron with quantum number given below (n,l,ml,,ms) – (1, 0, 0, +1/2) (n,l,ml,,ms) – (3, 1, 1, +1/2) 2 1s orbital 3py orbital What values of l, ml, allow for n = 3? How many orbitals exists for n=3? Video on Quantum numbers For n=3 -> l = n -1 =2 -> ml = -l, 0, +l -> -2, -1, 0, +1, +2 • mℓ range from −ℓ to ℓ, • ℓ = 0 -> mℓ = 0 –> s sublevel -> 1 orbital • ℓ = 1 -> mℓ = -1, 0, +1 -> p sublevel -> 3 diff p orbitals • ℓ = 2 -> mℓ = -2, -1, 0, +1, +2 -> d sublevel -> 5 diff d orbitals • (2l+ 1 ) quantum number for each ℓ value Answer = nine ml values – 9 orbitals/ total # orbitals = n 2 Click here video on quantum number Click here video on quantum number
37. 37. Acknowledgements Thanks to source of pictures and video used in this presentation Thanks to Creative Commons for excellent contribution on licenses http://creativecommons.org/licenses/ Prepared by Lawrence Kok Check out more video tutorials from my site and hope you enjoy this tutorial http://lawrencekok.blogspot.com