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Chapter 41: Q. 16 (page 1207)

a. Is a 4p鈫�4stransition allowed in sodium? If so, what is its wavelength (in nm)? If not, why not?

b. Is a3d鈫�4s transition allowed in sodium? If so, what is its wavelength (in nm)? If not, why not?

Short Answer

Expert verified

a. The wavelength of 4p鈫�4sis 2.214渭m.

b. 3d鈫�4stransition not allowed .

Step by step solution

01

Part (a) step 1: Given Information

We need to find the wavelength of 4p鈫�4s.

02

Part (a) step 2: Simplify

Now, finding the wavelength for 4p鈫�4stransition in sodium.

Using formula:

位=hc鈭�E位=1240eVnm3.75ev-3.19eV位=1240eVnm0.56eV位=2214nm鈫�2.214渭m

03

Part (b) step 1: Given Information

We need to find the wavelength of3d鈫�4s.

04

Part (b) step 2 : Simplify

We have to find the wavelength for 3d鈫�4stransition in sodium.

Then, 3d鈫�4sthe transition is not allowed because 鈭�l=2violates the selection rule that requires鈭�l=1.

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