Name:

Atomic and Molecular Orbitals Deadline: February 25, 2014

Homework #1

1. How many protons, neutrons and electrons are there in each of the following atoms and

ions?

a. 89Y d. 238U

b. 73Ge e. 35Cl-

c. 24Mg2+ f. 65Zn

2. Fill the missing information in the following table:

Symbol Number of p+ Number of n

0 Number of e

- Net charge

Br8035

12 12 2+

56 54

Ag10847

551

23......

........

....Co 32 2+

3. What is the wavelength corresponding to a neutron of mass 1.6710-27 kg moving at 2360

m/s?

4. An excited hydrogen atom emits light with a wavelength of 397.2 nm to reach the energy

level for which n = 2. In which principal quantum level did the electron begin?

5. Calculate the wavelength of light emitted when each of the following transitions occur in

the hydrogen atom. What type of electromagnetic radiation is emitted in each transition?

a. n = 4 n = 3

b. n = 5 n = 4

c. n = 5 n = 3

Using vertical lines, indicate the above transitions on an energy-level diagram for the

hydrogen atom.