3. (8 points) The emission spectrum of hydrogen can be divided up into series, w

Question

3. (8 points) The emission spectrum of hydrogen can be divided up into series, which repeesent particular electronic transitions in the H atom from higher energy levels to same lower energy level. For instance, the Paschen series consists of transitions from energy levels with n>3 to the n- 3 energy level. a. The line at 1875 nm in the emission spectrum of hydrogen is found to belong to the Paschen series. What transition in the H atom does this line correspond to? b. The Lyman series consist of transitions from energy levels with n > 1 to the n If an electron starts in the n 6 energy level initially, how does the wavelength of the photon emitted in the Paschen series compare to the wavelength of the photon emitted in the Lyman series? Explain your answer. 4. (6 points) Arrange the following elements (Ne, K, P, N) in order of the trends listed below a. Increasing effective nuclear charge b. Decreasing metallic character c. Increasing atomic radius Page 6

Explanation / Answer

4. a. Increasing effective nuclear charge: K<P<N<Ne

Effective nuclear charge Increases along the period and decreases along the group.

b. Decreasing metallic character: K> P>N>Ne

Metallic Character increases along group and decreases along the group.

c. Increasing atomic radius: Ne< N<P<K

Atomic radius increases along the group and decreses along the period.

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