Download Atomic Theory NS

Atomic Theory Notes
SC3. Students will use the modern atomic theory to explain the characteristics of atoms.
Dalton’s Atomic Theory
1. Elements are composed of indivisible particles called _____________________.
2. Atoms of the same element are ____________________________ & atoms of different
elements are _______________________________ from one another.
3. Atoms can be physically combined or chemically combined in ____________________ #
________________________ to produce ______________________________.
4. Reactions occur when atoms _______________________, ____________________, or
_________________ , but are never changed to atoms of another element in a reaction.
Atomic Structure
5. ______________________ are tiny units that determine the properties of all matter.
6. Atoms are the smallest unit of matter, although they can be broken into smaller pieces
called _______________________, ______________________, ___________________.
Subatomic Particles
7. Protons (___) have a charge of ______ and a mass of 1.673 x 10-24g.
8. Neutrons (no) have ______ charge and have the same mass as a ___________________
9. ___________________ (____) have a charge of _____ and a mass of 9.11 x 10 -28g.
10. _____________________________ & _______________________ are located in the
___________________________ of an atom.
11. __________________________ orbit the nucleus in energy levels.
12. Within each energy level, the electrons occupy ______________________________.
Electrons
13. Who discovered the Electron by using a cathode ray tube (CRT)?
14. Ran electricity through a gas causing a glowing beam of light in the tube.
15. The glow was due to the motion of the _________________________ in each
____________________ _____________________.
Atomic Theory Notes
SC3. Students will use the modern atomic theory to explain the characteristics of atoms.
Protons
16. Eugene Goldstein observe CRT with rays moving toward the CATHODE (- pole) of the
tube. Explain the observations…
17. ____________________________ proved the existence of protons in 1919.
Neutrons
18. ___________________________________ particles found in the nucleus.
19. Proven in 1932 by _______________________________
Nucleus
20. Discovered by Rutherford in the “______________ _______________ _________________”
21. Rutherford shot ____ particles (________________________) at gold foil, most passed through,
but some ________________________________.
22. Proposed a model of the atom containing mostly _________________ space with a ______
charge and ____________ concentrated in the ____________________________ region called
the ________________________________.
Niels Bohr (1913)
23. Bohr suggested that e- were in _________________________ around the __________________
and each e- has a certain _________________________ that determines the path around the
nucleus.
24. These paths are called _______________________ _______________________.