Category Archives: 2/12 Atomic Theory

Atomic Structure

History of Atomic Theory

Watch the video below.

✍️    In your notebook, draw an annotated diagram to represent the ideas on the structure of the atom from each of the following scientists:

  1. Democritus
  2. Dalton
  3. Rutherford
  4. Bohr
  5. Heisenberg

Structure of the Atom

What does an atom mainly consist of?

✍️   To get an idea of the proportions within an atom, look at the following video.  After watching it, write a brief summary of the main points in your notebook.

✍️   Examine table 4 in your data booklet.  How much more mass does a proton or neutron have compared to an electron?

Take a look at the figure below describing nuclear symbols.

What is the difference between the mass number and the atomic number?

✍️  For each of the three examples above, write down the number of protons, electrons and neutrons represented by the notation.

Below is a simulation that can be used to practice this notation.  Choose the game option and try all the puzzles.  Don’t move to the next puzzle until you get 5 out of 5!

Electromagnetic Spectrum

Electromagnetic Spectrum

Table 3 in your data booklet has a version of the electromagnetic spectrum.

✍️  Using Table 3 and the graphic above, describe the relationships between colour, wavelength, frequency and energy across the spectrum.  Make a summary in your notebook.

Find an example of:

  • an emission spectrum
  • a line spectrum
  • an absorption spectrum

What are the key differences and similarities?
Which of the above were we looking at when we viewed the purple light given off from the hydrogen sample through the diffraction grating in our last class?

Watch the two videos below on the emission spectrum of hydrogen and read the section in your text.  Make a summary for discussion in class tomorrow.

Video #1

Video #2

At the end of this animation, you can try the different transitions yourself.