Download Chapter 4 Exam Review Democritus named tiny pieces of matter

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?
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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
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