ALS2Q - Section 2/ The Electronic Structure of Atoms and...

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Section 2/ The Electronic Structure of Atoms and the Periodic Table / SKH Bishop Baker Secondary School AL Chemistry Section 2 The Electronic Structure of Atoms and the Periodic Table 80 IA Q.4 (a) Give the ground state electronic configuration of an atom of: (i) Strontium (atomic number 38) (ii) Chromium (atomic number 24) (2 marks) 81 IA Q.4 (a) In the space provided sketch the curve showing the variation of the first ionization energy with atomic number, for the elements Na to Cl. (2 marks) 81 IB Q.6 (a) In the atomic emission spectrum of hydrogen, the frequencies of the first four lines in the Lyman series have been measured and are given below : n = 2 n = 3 n = 4 n = 5 Transition to to to to n = 1 n = 1 n = 1 n = 1 Frequency / Hz 2.466 x 10 15 2.923 x 10 15 3.083 x 10 15 3.157 x 10 15 Calculate the frequency of the first line in the Balmer series in the atomic spectrum of hydrogen. You may or may not need the following constants : Planck’s constant = 6.626 x 10 -34 J s Velocity of light = 3 x 10 8 m s -1 (4 marks) 82 IB Q.8 (a) Describe in qualitative terms the origin and characteristics of the emission spectrum of an atom. What is the difference, in both origin and appearance, between an absorption spectrum and an emission spectrum of an atom ? ( Note : The concept of absorption spectrum is NOT required in the existing syllabus.) (7 marks) 1
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Section 2/ The Electronic Structure of Atoms and the Periodic Table / 82 IIB Q.10 (a) In the light of the information given in the following table, comment on the relative chemical reactivities of the inert gases in the series : He Ne Ar Kr Xe Rn First ionization energy / kJ mol -1 2 372 2 080 1 522 1 353 1 163 1 040 (4 marks) 83 IB Q.6 (a) (i) Define the first ionization energy of an atom. (ii) Why does helium have the highest first ionization energy of all elements ?
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ALS2Q - Section 2/ The Electronic Structure of Atoms and...

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