Radioactivity Poster
Radioactivity
The emission of high energy particles or
waves from unstable atoms
The emissions occurs
when the nucleus falls
apart during
RADIOACTIVE DECAY
Example
Its hot to the touch
How many
protons and
neutrons did it
lose?
10 p+ and 32 N
Uranium-238
goes through 14
radioactive
changes to get
to Lead-206
Half Life
Half-Life is the # of years it takes for half
of an unstable atom decay into another
atom
It takes 4.5 billion years for half of uranium to
change to another element. So its HALF-LIFE=
4.5 billion years
Half Life of the M&M
M&M with the M up(Eminemium)= Parent Isotope
M&M with the M down(Noeminemium)= Daughter
Isotope
The Half-life of Eminemium is 5 years
Half
Years
Parent
Daughter
Life
Passed
Isotope left Isotope left
0
0
1
5
2
10
3
15
4
20
100 %
0
Eminemium= Color 1
Noeminemium= Color2
100%
Hydrogen atoms fuse to form
helium. Energy is given off
when this occurs.
H-1
75%
H-2
Collision
50%
25%
Energy is given off
1
2
3
Using a neutron to split a very
large unstable atom.
Used in nuclear powerplants
to make lots of heat, steam,
and electricity
4
He- 4
5
1. A NEUTRON is
shot at a large
unstable atom like
uranium
2. Atom gains Neutron
and becomes more
unstable
3. Atom splits into TWO
DAUGHTER ATOMS and 3
NEUTRONS
4. Extra Neutrons fly
off to hit other atoms
causing a CHAIN
REACTION
Energy Unit Blingo
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Kinetic Energy
Potential Energy
Bottom of hill
Top of hill
mgh
½ mv^2
Protons
Neutrons
Electrons
Nucleus
Outside of atom
Isotope
Ion
Positive charge
Negative charge
Static electricity
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Law of conservation of energy
Element
Atom
Atomic number
Mass number
Beta decay
Alpha particle
Nuclear fusion
Nuclear fission
Half-life
Attract
Repel
Height
velocity
WarmUp (11-16-12)
• Describe:
Alpha decay:
Beta decay:
WarmUp 11/19/12
• How much of a uranium sample is left after
two half lives?
• 25% is left after two half lives
• http://phet.colorado.edu/en/simulation/radio
active-dating-game