link to Chemistry gateway, which contain links to videos about various chemistry concepts - you'll have to find the relevant specific link(s) to do this assignment.

on a sheet of paper, (i) answer the below questions based on your textbook and the above video link, (ii) include textbook page number(s) and url of the website (or sequence of links starting from the above link), where you found the answer, and (iii) include the names of all group members and identify the recorder.

topic(s): introduction to an atom

questions [15 points]

1. what is the composition of an atom ? [1 point]

2. what is the charge and mass (in amu) of each component in an atom ? [1 point]

3. describe the structure of an atom. [1 point]

4. what does the atomic number respresent ? what does the mass number represent ? [1 point]

5. what's the relationship between the number of protons and electrons in an atom ? [1 point]

6. based on the preceding information, fill-in the below table in regards to various (hypothetical ?) atoms. [10 points]

symbol # protons # neutrons # electrons mass number
23Na        
  24 25    
      14 29

to ponder - for interested students - no points

7. "why" does the protons remain together in the nucleus despite the electrostatic replusive force between them ? video

8. "why" does electron's orbit not collapse into the nucleus despite the electrostatic atttractive force between them ? text