1. Chapter 2 Practice questions

2. Do Now 10/1 How are ions formed? Fill in the following table
Use the average atomic mass of chlorine determine the relative abundance of 35Cl and 37Cl
Species
Protons
Neutrons
electrons 30 35 28
7Li+ 15 16
14N3- 3 7

3. Which of the following is correct?
Emission and absorption spectra both provide evidence for:
The existence of neutrons b. the existence of isotopes
c. The existence of atomic energy levels d. the nuclear model of the atom.
Ultraviolet (UV)
Infrared (IR) A
High energy
Short wavelength
Low energy
Low frequency B
Long wavelength C
High frequency D

5. 1. The diagram shows the lowest five electron energy levels in the hydrogen atom
Deduce how many different frequencies in the visible emission spectrum of atomic hydrogen would arise as a result of electron transitions between these levels.
3 b. 4 c. 6 d. 10
2. Identify which of the following provide evidence to support the Bohr model of the hydrogen atom?
I The energy of the lines in the emission spectra of atomic hydrogen
II the energy of the missing lines in the absorption sepectra of helium as seen from the sun.
III the relative intensity of the different spectral lines in the emission spectrum of atomic hydrogen
a. I only b. II only c. I and II d. I and III

6. Bohr models (basis for electron configuration)
Draw a bohr model of sulfur
Draw a bohr model for calcium

7. Bohr models (basis for electron configuration)
Draw a bohr model of sulfur
Draw a bohr model for sodium
Draw a bohr model for calcium