Ground state E1E1 E2E2 E3E3 E4E4 E5E5 Energy levels continue to get closer until they finally converge at..... E  THE HYDROGEN ATOM NUCLEUS ELECTRON The.

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Presentation transcript:

Ground state E1E1 E2E2 E3E3 E4E4 E5E5 Energy levels continue to get closer until they finally converge at..... E  THE HYDROGEN ATOM NUCLEUS ELECTRON The “Ground State” is the lowest energy level available to the electron. Other energy levels may be added as follows: [CLICK]

E2E2 [CLICK FOR ELECTRON TO OCCUPY HIGHER LEVELS]

E3E3

E4E4

E5E5

Electron has been excited to just beyond   [CLICK TO CONTINUE]

When the H atom receives enough energy for the electron to be excited to just beyond the outermost energy level, E , it is said to be “ionised”. This is represented by the equation: H (g) H + (g) + e -  H = IONISATION ENTHALPY In order to determine the value of  H for this process the LYMAN series of the atomic emission spectrum must be examined which lies in the UV region. This arises as follows:

Frequency/ Hz LYMAN SERIES As the electron falls from higher to lower energy level, E 2 to E 1,, so a photon of light is emitted with frequency, v, given by the equation :  E = E 2 - E 1 = h X v [ where h is Plank’s constant with the value of 6.63 X JHz -1 ]

Frequency/ Hz LYMAN SERIES

Frequency/ Hz LYMAN SERIES

Frequency/ Hz LYMAN SERIES

Frequency/ Hz This energy drop,  E = E  - E 1, is the identical value to the energy required to ionise the atom. LYMAN SERIES

Frequency/ Hz The frequency at the convergence limit is 3.27 x Hz LYMAN SERIES The ionisation enthalpy,  H = h X v =6.63x x 3.27x10 15 =2.17 x joules Now express this in kJ mol -1

THE END