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Name: ___________________________________ Date _________________ Per _____ Lab3: 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. 2. . Build some atoms, and write down two examples that have a stable nucleus and neutral charge. Include a bohr model of your atom. Bohr Model of Atom Electrons: _____ Name: _____________________ Protons: _____ ___________________________ Neutrons: _____ Chemical Symbol: ____________ Electrons: _____ Name: _____________________ Protons: _____ ___________________________ Neutrons: _____ Chemical Symbol: ____________ Electrons: _____ Name: _____________________ Protons: _____ ___________________________ Neutrons: _____ Chemical Symbol: ____________ Part II: Making Ions Not all atoms are neutral. Many have a charge. These charged atoms are called ions. Some are more positive and some are more negative. We call the charge on such an atom the “net charge”, or “total charge”. 1. Make a neutral Beryllium atom. What would you do to make a beryllium atom with a negative charge? 2. Make the neutral Beryllium atom again. What would you do to make a beryllium atom with a positive charge? Complete the table below by building some specific elements by filling in the blanks and drawing the bohr model of that atom. Bohr Model of the Atom Electrons: 10 Name: Oxygen Protons: _____ Charge: _____ Symbol: __________ Electrons: 2 Name: _____________________ Protons: 3 Charge: _____ Symbol: __________ Electrons: _____ Name: Fluorine Protons: _____ F Charge: – 1 Symbol: Electrons: 2 Name: _____________________ Protons: _____ Symbol: B Charge: _____ Analysis Questions 1. Ions are atoms of the same element with different numbers of __________________. 2. Isotopes are atoms of the same element with different numbers of __________________. 3. Adding or removing protons from an atom does what to the atom? _________________________________. 4. An atom with the same number of protons and electrons has a charge of _________. 5. Adding two electrons to a neutral atom produces an ion with a ____________ charge. 6. An atom with six protons and five electrons would have a ______________charge. 7. What atom is created with nine protons, nine neutrons, and nine electrons?________________ 8. Show the full symbol for the above atom (Q7) in the box at the right 9. What does the upper-left number in the symbol represent? __________________ 10. What does the lower-left number in the symbol represent? __________________ Extra Credit:The Game Click the tab at the top that says “Game” Call me over when you complete a level with a perfect score, and I will check it off. Level 1 _____ Level 2 _____ Level 3 _____ Level 4 _____