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1s 2

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

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1s 2

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  1. 2+ 1s2 2+ n+ 1+ 1+ 1s ENERGY OF ELECTRONS – ENERGY CONSERVATION 1. IONIZATION ENERGIES EI1 = +2375 EI2 = +5248 2+ Repulsion 1s1 He2+ He He+ Energy kJ/mol 0 E i1 = + 2375 -2375 E He electron E i2 = + 5248 electron lower energy (more negative) since has more attraction to nucleus E destabilization from e repulsion -5248 E He+electron E i1 + E destabilization = E i2 ENERGY CONSERVATION photon 2. PHOTOELECTRIC EFFECT E kin y = mx + b E in = E out hn = E ion + E kin OR n b E kin = hn – b OR E kin + b = hn OR E kin + E ion = hn ENERGY CONSERVATION ENERGY CONSERVATION photon + energy in 1+ Heat, electrical E 3. H EMISSION SPECTRA 2s 0 n = 2 -328 E = -1312/n2 DE electron = E1 – E2= -1310 – (-328) = - 982 (DE electron = E final – E initial = E1 – E2) n = 1 -1310 kJ/mol ENERGY CONSERVATION DE electron + E photon = 0 or- DE electron = E photon = hn = 982 kJ/mol

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