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Transcript
Chapter 4 Exam Review 1. Democritus named tiny pieces of matter that cannot be divided ________________________________. 2. According to Dalton, when elements combine in a compound the ratio of their masses is always the ________________________ 3. What are the main points of Dalton’s Theory? 4. Describe Dalton’s model of an atom: 5. Thomson’s experiments provided evidence that an atom contains ____________________________ __________________________ particles. 6. During the gold foil experiment, what caused some of the alpha particles to bounce straight back from the gold foil? ______________________________________________________________ 7. The gold foil experiment provided evidence that there is a ____________, ___________________________ charged mass in the ___________________________ of an atom. 8. Who provided evidence for the existence of a nucleus in an atom? ___________________________________ 9. In an atomic model that includes a nucleus, positive charge is located where? _________________________________________________________________________________________ 10. What statement does your book use to describe Rutherford’s model of the atom? ______________________________________________________________________________________________ 11. Subatomic Particle Proton Neutron Electron Charge Relative Mass 12. What is unique to any given element? _____________________________________________________________ 13. The number of protons in an one atom of an element is that element’s ______________________________ 14. How do you find the number of neutrons in an atom? 15. According to Bohr’s electrons move like ________________________________________________________________ 16. What can you assume has happened if an electron moves to a higher energy level? ______________________________________________________________________________________________ 17. How was Bohr’s atomic model similar to Rutherford’s model? ______________________________________________________________________________________________________________ 18. How does Bohr explain the arrangement of electrons in an atom? _____________________________________________________________________________________________________________ 19. What do scientists use to predict the locations of electrons in atoms? _______________________________ 20. What does the electron cloud model describe? _________________________________________________________ 21. How many electrons can one orbital contain? ________________________ 22. An electron cloud represents all the ______________________________ in an atom 23. An atoms lowest energy level has _______________ orbital. 24. The most stable electron configuration is the on in which the electrons are in orbitals with the ___________________________________________________________________________________________________________ 25. When all the electrons in an atom have the lowest possible energies, he atom is said to be in its _________________________________________________________________ 26. What is state is less stable? ________________________________________ 27. The glowing of a neon light is caused by electrons emitting energy as they move from ______________________________________________________________________________________________