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4 marksAtomic Structure and the Periodic Table

CAPE Chemistry Unit 1 · 2009 · Paper 2 · Question 1(a)(iii)

Each element has a characteristic 'fingerprint' line emission spectrum. Niels Bohr, in 1913, proposed an explanation for the emission spectrum of the elements.

Explain, in terms of electronic transitions, the origin of the lines in the Balmer series.

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Other parts of this question

  1. 1(a)(i)State the property of elements which is responsible for the characteristic line spectrum of each element.[1 mark]
  2. 1(a)(ii)Sketch a diagram of the line emission spectrum of hydrogen. On your diagram, indicate the direction of increasing frequency and increasing wavelength.[3 marks]
  3. 1(a)(iv)State the region of the electromagnetic spectrum in which the lines in the Balmer series occur.[1 mark]
  4. 1(a)(v)Calculate the energy (E) of a quantum of radiation with a corresponding frequency (v) of 4.57 x 10^14 Hz. (h = 4 x 10^-13 kJ s mol^-1)[2 marks]
  5. 1(b)Identify FOUR errors in the assembly of the apparatus in Figure 1.[4 marks]

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