Atomic Theory-Study Sheet-Updated 9/15
*Reminder-Review Notes and this Question/Answer sheet DAILY to prepare for your next test. Goal: Grade of “A”.
*Flash Review….Test October 7th
How to use this study guide-Print the page and fold between questions and answers OR cover the answer column. Ask yourself the questions and see if you can correctly answer. Use it until you can answer ALL questions quickly with 100% accuracy. Do a little every day, and you will be ready for the next test!
History of Atomic Theory (9/13)
First scientist to propose a model of the atom
Smallest unit of matter
Substance made of multiple identical atoms
Dalton’s incorrect theory
The atom is indivisible
Plum pudding model for the atom
Particles suggested by Thomson
Gold foil experiment
Particles suggested by Rutherford
Where Rutherford suggested protons are found
Theorized that electrons move in set orbits around the nucleus
Structure of the Atom (9/14)
Electrons, protons, & neutrons
The three sub-atomic particles are…
Sub-atomic particle found in the nucleus; + charge
Sub-atomic particle that orbits the nucleus; - charge
Sub-atomic particle found in the nucleus; no charge
Every element has a distinct number of …
This is based on the number of protons in an element
The number of Protons
The atomic number of an element is determined by…
Protons + Neutrons
The atomic mass of an element is equal to its…
1 AMU or g
What is the mass of a proton?
Negligible (too small to count)
What is the mass of an electron?
1 AMU or g
What is the mass of a neutron?
Increasing atomic number
Elements on the periodic table are arranged in order of …
# of electrons = # of protons
What is the relationship between protons and...
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