Rachel Celestin - Lab3 Build an Atom PhET.doc.pdf - Name: ...

Name: ___________________________________ Date _________________ Per _____
Build An Atom PhET Lab
Introduction: Atoms are the smallest things that retain the properties of matter we can
observe. Atoms are made of three subatomic particles; protons, neutrons, and electrons.
• Protons have a relative mass of ___________ amu and a charge of ___________.
• Neutrons have a relative mass of ___________ amu and a charge of ___________.
• Electrons have a relative mass of nearly___________ amu and a charge of ___________.
In this simulation, you will build atoms, subatomic particle by subatomic particle and observe the
effect of adding more of each particle. When the subatomic particles in an atom change, an ion ,
isotope or different element will be created.
Procedure: Play with the Sims → Chemistry → Build An Atom
Begin by playing with the simulation for a while. Become familiar with the
interface. What happens when you add protons, neutrons, or electrons? To
start over, click .
Show the symbol , atomic mass , and charge by clicking on the .
1. Build some atoms, and write down two examples that have a stable nucleus and neutral charge .