1s 2

1

He 2+ 1s 2 He + 2+ 1s 1 He 2+ 2+ E I1 = +2375 E I2 = +5248 Energy kJ/mol 0 -2375 -5248 E i1 = + 2375 E i2 = + 5248 Repulsion E He electron E He + electron E destabilization from e repulsion ENERGY OF ELECTRONS – ENERGY CONSERVATION electron lower energy (more negative) since has more attraction to nucleus n+ photon E in = E out h = E ion + E kin OR E kin E kin = h – b OR E kin + b = h OR E kin + E ion = h b 2. PHOTOELECTRIC EFFECT E i1 + E destabilization = E i2 ENERGY CONSERVATION ENERGY CONSERVATION ENERGY CONSERVATION 1s 1+ 2s + energy in 1+ photon 1+ E 0 -1310 kJ/mol -328 E = -1312/n 2 n = 1 n = 2 E electron = E 1 – E 2 = -1310 – (-328) = - 982 Heat, electrical GY CONSERVATION E electron + E photon = 0 or - E electron = E photon = h = 982 kJ/ 3. H EMISSION SPECTRA E electron = E final – E initial = E 1 – E 2 ) 1. IONIZATION ENERGIES y = mx + b

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2+. 1s 2. 2+. n+. 1+. 1+. 1s. ENERGY OF ELECTRONS – ENERGY CONSERVATION. 1. IONIZATION ENERGIES. E I1 = +2375. E I2 = +5248. 2+. Repulsion. 1s 1. He 2+. He. He +. Energy kJ/mol. 0. E i1 = + 2375. -2375. E He electron. E i2 = + 5248. electron lower energy - PowerPoint PPT Presentation

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He

2+

1s2

He+

2+

1s1 He2+

2+

EI1 =+2375

EI2 =+5248

EnergykJ/mol

0

-2375

-5248

E i1 = + 2375

E i2 = + 5248

Repulsion

E He electron

E He+

electron

E destabilization

from e repulsion

ENERGY OF ELECTRONS – ENERGY CONSERVATION

electron lower energy(more negative) sincehas more attraction tonucleus

n+

photon

E in = E out

h = E ion + E kinOR

E kin

E kin = h – b OR

E kin + b = hOR

E kin + E ion = h

b

2. PHOTOELECTRIC EFFECT

E i1 + E destabilization = E i2 ENERGY CONSERVATION

ENERGY CONSERVATION

ENERGY CONSERVATION

1s

1+

2s

+ energy in1+

photon

1+

E0

-1310 kJ/mol

-328

E = -1312/n2

n = 1

n = 2

E electron = E1 – E2 = -1310 – (-328) = - 982

Heat,electrical

ENERGY CONSERVATIONE electron + E photon = 0 or - E electron = E photon = h = 982 kJ/mol

3. H EMISSION SPECTRA

E electron = E final – E initial = E1 – E2)

1. IONIZATION ENERGIES

y = mx + b

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