Question

1.Rank the following types of light - radio waves, gamma rays, microwaves, red light, blue light - in terms of: a.Increasing energy per photon b.Increasing wavelength c.Increasing frequency 2.Without doing any calculations, determine which of the transitions would result in the absorption of light of longest wavelength? Explain your choice . n = 1---> n = 3 n = 3 ----> n = 2 n = 1 ----> n = 7 n = 2 ----> n = 1 n = 7 -----> n = 5 3.According to the Quantum-Mechanical model, a.Sketch the s-orbital and all of the p-orbitals b.Which orbital is larger? i.2s or 3s ii.2p or 4p iii.3d or 5d Write the full electron configurations for each below(Both line form and box form): a.B b.Mg c.Cl d.V e.As f.Rb

Answer 1

1.

a.Increasing energy per photon

radio waves < microwaves < red light < blue light < gamma rays

b.Increasing wavelength

gamma rays < blue light < red light < microwaves < radio waves

c.Increasing frequency

radio waves < microwaves < red light < blue light < gamma rays

Note: The order for increasing frequency is same as the order for increasing energy per photon.

The order for increasing wavelength is the reverse.

2. The transition n = 7 -----> n = 5 would result in the absorption of light of longest wavelength.
As teh value of n increases, the separation between different energy levels decreases. The energy difference between two levels is lowest and the wavelength is longest.