2_elec_str - < elec_st/AL90P2_2c 2(c Give a brief account...

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<<< elec_st/AL90P2_2c 2. (c) Give a brief account of the Balmer series in the spectrum of the hydrogen atom. (4 marks) <<< elec_str/AL91P2_3c 3. (c) Give a brief account of the electron density of the 1s orbital of a hydrogen atom. (4 marks) <<< elec_str/AL92P1_2c 2. (c) Give the shape of a 1s-orbital and comment on its physical significance. (2 marks) <<<elec_str/AL92P2_1a 1. (a) (i) Describe any one experimental method to determine the first ionization energy of an element. (ii) Arrange the following elements in order of increasing first ionisation energy: F, Ne and Na. Explain your order. (iii) Describe and explain the variation of the successive ionization energies of potassium. (8 marks) <<< elec_str/AL94P1_1a 1. (a) (i) Write an equation to represent the change related to the second electron affinity of oxygen. (ii) The first and second electron affinities of oxygen are -142 kJ mol -1 and 791 kJ mol -1 respectively. Explain why they have opposite signs. (iii) Explain why all the inert gas have opposite first electron affinities. (4 marks) <<< elec_str/AL95P1_1a 1. (a) (i) The first four successive ionization energies of an element A are 578, 1817, 2746 and 10813 kJ mol -1 respectively. To which group in the Periodic Table does A belong?
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