1. Atomic Structure
Regents Review

2. Fact #1 – Basic unit of matter is the _______ - ___________ model atom
Dalton
– Basic unit of matter is the _______
- ___________ model
atom
Cannon ball

3. Fact #2 JJ Thomson - Used ___________ tube - Discovered ________
- “_____________” model
cathode ray
electrons
Plum pudding

4. Fact #3 Rutherford – __________ experiment - Small, dense, _________
charged _______
- mostly ____________
Gold foil
positively
nucleus
empty space

5. Fact #4 Bohr - Nucleus surrounded by electrons in circular ______
orbits

6. Fact #5 positive Atoms have a _______ charged nucleus, surrounded by
__________ charged electrons
negatively

7. Fact #6 - Protons and neutrons are found in the _______
- Protons are ________,
neutrons have ________,
electrons are _________
nucleus
positive
no charge
negative

8. Fact #7 - In an atom: # _______ = # ________
- Atomic Mass – average of all
naturally occurring ________
- # neutrons =
______# - ______ #
protons
electrons
isotopes
mass
atomic

9. Fact #13 Isotopes – same number of _______, different number protons
neutrons

10. Fact #8 - Mass of a proton and neutron are ______; electron _______
- Positive ion = ____ electrons,
negative ion = ______ electrons
1 amu
< 1 amu
lose
gain

11. Fact #9 Orbital - ________ – regions of the most probable _________
location
- Each electron in an atom has
its own specific amount of
_______
electron
energy

12. Fact #10 - Electrons have a _____ energy state in the ________ state
- Energy is _________ when
electrons fall back from the
________ to the _________
state
higher
excited
released
excited
ground

13. Fact #11 spectrum - Bright light _________ is produced when electrons
return to _________ state
ground

14. Fact #12 Valence - ________ electrons - outermost electrons
- _______ electrons affect
________ properties of an
element
Valence
chemical

15. Fact #14 Ground - _______ state electron
configuration matches periodic
table; _______ state does not
excited

16. Fact #15 - Lewis dot structure; a dot represents a ___________
valence
electron

17. Fact #16 Calculate the atomic mass of an element:
given mass *(% ÷ 100) + given
mass * (% ÷ 100)