Unit 2 Atomic Theory Review
A. Atomic Theory
Basic Atomic
Structure
Electron
Nucleus (protons)
Charge:______
Discovered by:_____________
Charge:______
Discovered by:_____________
Early Atomic Models
Democritus
Dalton
JJ Thomson
Rutherford
Year:______
Year:______
Drawing of atomic
model:
Year:______
Drawing of atomic
model:
Year:______
Drawing of atomic
model:
4 Main Ideas:
What he discovered:
What he discovered:
Equipment used:
Equipment used:
2 Main Ideas:
1. John Dalton, Ernest Rutherford, and J.J. Thomson all contributed to our understanding of the atom.
Choose one of the scientists listed above and explain his contribution to our current understanding
of atomic theory and/ or atomic models. You need at least 4 distinct facts about the scientist. You
should include information about:
a. specific experiments done by the scientist
b. discoveries that were made
c.
theories that were developed
d. models that were proposed
B. Subatomic Particles
1. The atomic number of an atom is determined by the number of ____________________.
2. The mass number of an atom is determined by the number of ____________ and _____________
3. Isotopes of an element contain different numbers of _____________________________.
4. The nucleus of an atom contains ________________________________________.
5. Which two subatomic particles have an equal, but opposite charge?
5. If an ion has a negative charge, it contains (more, less) electrons than protons.
6. If an ion has a positive charge, it contains (more, less) electrons than protons.
Fill in the blanks.
7. Platinum (Pt)
8. Tungsten (W)
9. Iodine (I)
Protons: 78
Protons: ________
Protons: 53
Neutrons: 117
Neutrons: 110
Neutrons:
Electrons:
________
Electrons:
________
Electrons:
__
Atomic Number: _______
Atomic Number: ________
Atomic Number:
Mass Number:
Mass Number:
Mass Number:
________
184
127
10. Zirconium+2 (Zr+2)
11. Phosphorus-3 (P-3)
12. Osmium-190
Protons:
________
Protons:
Protons:
Neutrons:
________
Neutrons: 16
Neutrons: _____
Electrons:
________
Electrons: 18
Electrons: _____
Atomic Number: 40
Atomic Number: ______
Atomic Number: 76
Mass Number:
Mass Number:
Mass Number: _____
91
_______
______
_____