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Name: ________________________________________________ THE BOHR MODEL A Bohr model is a model of the atom developed by the passionate soccer player and physicist, Niels Bohr. The model shows the number and location of an atom’s protons, neutrons and electrons. Electrons are placed in energy levels. Remember that the outermost energy level holds the valence electrons, which determine the atom’s chemical properties including reactivity. Practice Bohr Models: (Notice that the nucleus is drawn with a square in these models.) Draw a Bohr model for the first 20 elements and fill in the missing information. Start at 1 with hydrogen, and continue in order of atomic number. Element Symbol, Name, and Atomic Number Bohr Model # of valence electrons Period Group Metal, nonmetal or metalloid Metal Non-metal Metalloid Metal Non-metal Metalloid Metal Non-metal Metalloid Metal Non-metal Metalloid Metal Non-metal Metalloid Element Symbol Bohr Model # of valence electrons Period Group Metal, nonmetal or metalloid Metal Non-metal Metalloid Metal Non-metal Metalloid Metal Non-metal Metalloid Metal Non-metal Metalloid Metal Non-metal Metalloid Element Symbol Bohr Model # of valence electrons Period Group Metal, nonmetal or metalloid Metal Non-metal Metalloid Metal Non-metal Metalloid Metal Non-metal Metalloid Metal Non-metal Metalloid Metal Non-metal Metalloid Element Symbol Bohr Model # of valence electrons Period Group Metal, nonmetal or metalloid Metal Non-metal Metalloid Metal Non-metal Metalloid Metal Non-metal Metalloid Metal Non-metal Metalloid Metal Non-metal Metalloid Questions: 1. What patterns do you notice as you move across a period on the Periodic Table? _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ 2. What patterns do you notice as you move down a group on the Periodic Table? _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ 3. Compare the group number to the number of valence electrons. What do you notice? _____________________________________________________________ _____________________________________________________________ 4. When two atoms approach one another, their outermost electrons come in close contact. The negative charges of the electrons repel each other and most of the time, the atoms bounce off each other. Sometimes, the atoms will exchange or share electrons. Valence electrons are significant because _____________________________________________________________ _____________________________________________________________ 5. Which families do you think would be most likely to react with other elements? Why? _____________________________________________________________ _____________________________________________________________ 6. An individual atom’s identity is set by _______________________________ 7. Fill in the missing information about each sub-atomic particle’s charge: proton _______ __________ no charge electron _______ 8. What soccer playing scientist developed the model of the atom used in this activity? _____________________________________________________ 9. Atoms have no charge because ________________________________________ __________________________________________________________________
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