alpha decay. radioactive decay alpha decay radioactive decay alpha decay beta decay
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Alpha Decay
Radioactive Decay
Radioactive Decay
Alpha Deca
y
Radioactive Decay
Alpha Deca
y
Beta Deca
y
Radioactive Decay
Alpha Deca
y
Beta Deca
y
Gamma
Decay
Radioactive Decay
Alpha Deca
y
Beta Deca
y
Gamma
Decay
Alpha Decay
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A large unstable nucleus
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Alpha Decay
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Alpha Decay
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+An alpha particle
A smaller, more stable nucleus
Alpha Decay
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The PARENT nucleus
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Alpha Decay
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The PARENT nucleus
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Alpha Decay
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The PARENT nucleus
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An alpha particle
Alpha Decay
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The PARENT nucleus
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An alpha particle
The DAUGHTER
nucleus
Alpha Decay
N+N
+An alpha particle
An Alpha Particle
An Alpha Particle
N+N
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An Alpha Particle
N+N
+ protonproton
An Alpha Particle
N+N
+ proton
neutron
neutron
proton
An Alpha Particle
N+N
+ protonproton
An Alpha Particle
N+N
+ protonproton
An Alpha Particle
N+N
+
42He
An Alpha Particle
N+N
+24He
A charge of +2
An Alpha Particle
N+N
+24He
A charge of +2
An Alpha Particle
N+N
+24He
Mass #
An Alpha Particle
N+N
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42He
An Alpha Particle
N+N
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42He
proton
neutron
neutron
proton
An Alpha Particle
N+N
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42He
Total mass= 4
proton
neutron
neutron
proton
An Alpha Particle
N+N
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42He
Mass #
Total mass= 4
An Alpha Particle
N+N
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42He
Mass # = 4
Total mass= 4
An Alpha Particle
N+N
+24He
Mass # = 4
An Alpha Particle
N+N
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42He
The symbol for an Alpha
Particle
An Alpha Particle
N+N
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42He or
An Alpha Particle
N+N
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42He or
Another symbol for an Alpha Particle
An Alpha Particle
N+N
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42He or
Another symbol for an Alpha Particle
42or
Some Examples of Alpha Decay
241 237 495 93 2Am Np He
Alpha decay of americium–241
22419
3793 25
4Np HeAm
The Parent Nucleus
Alpha decay of americium–241
2241 49
72935
3 Nm pA He
The Daughter Nucleus
Alpha decay of americium–241
241 237 4295 93Am N ep H
An Alpha Particle
Alpha decay of americium–241
241 23724
95 93Am Np He Charge
Alpha decay of americium–241
ChargeCharge
241 23724
95 93Am Np He Protons
Alpha decay of americium–241
ProtonsProtons
241 23724
95 93Am Np He
Alpha decay of americium–241
Atomic Number
Atomic Number
Atomic Number
241 23724
95 93Am Np He Charge
Alpha decay of americium–241
ChargeCharge
241 23724
95 93Am Np He Charge
Alpha decay of americium–241
ChargeCharge
241 237 493 295Am Np He
Alpha decay of americium–241
Total charge on left = 95
241 23724
9395Am Np He
Alpha decay of americium–241
Total charge on left = 95
Total charge on right =93 + 2 = 95
241 23724
95 93Am Np He
Alpha decay of americium–241
Mass Mass Mass
241 23724
95 93Am Np He
Alpha decay of americium–241
protons + neutrons
protons + neutrons
protons + neutrons
241 23724
95 93Am Np He
Alpha decay of americium–241
Mass number Mass number Mass number
241 23724
95 93Am Np He
Alpha decay of americium–241
Mass Mass Mass
237 49245 93 21Am Np He
Alpha decay of americium–241
Total mass on left = 241
22419
375 93 2
4Am Np He
Alpha decay of americium–241
Total mass on left = 241
Total mass on right
237 + 4 = 241
241 237 4295 93Am N ep H
Alpha decay of americium–241
An Alpha Particle
241 23795 93
42Am Np
Alpha decay of americium–241
An Alpha Particle
241 23795 93
42Am Np
Alpha decay of americium–241
An Alpha Particle
Alpha decay of radium–222
An Alpha Particle
222 4 21888 2 86Ra He Rn
The Parent Nucleus
The Daughter Nucleus
222 4 21888 2 86Ra He Rn
ChargeChargeCharge
Alpha decay of radium–222
Alpha decay of radium–222
222 4 21888 2 86Ra He Rn
Mass Mass Mass
Alpha decay of radium–222
222 2188 8
428 6H neRa R
An Alpha Particle
Alpha decay of radium–222
42
222 21888 86Ra Rn
An Alpha Particle
Alpha decay of radium–222
42
222 21888 86Ra Rn
An Alpha Particle
Filling in the Missing Particle
234238 42 09 92U H he T ?
234238 42 09 92U H he T
Charge
234238 4292 90U H he T
Charge
= 92
Charge
234238 4292 90U H he T
Charge
= 92
Total charge on right= 90 + 2 = 92
Charge
Charge
234238 42 09 92U H he T
Charge
= 92
Total charge on right= 2 + 90 = 92
Charge
= 2
Charge
234238 42 09 92U H he T
Charge
= 92
Total charge on right= 2 + 90 = 92
Charge
= 2
Charge
= 90
234238 42 09 92U H he T
Charge
= 92
Total charge on right= 2 + 90 = 92
Charge
= 2
Charge
= 90
thorium
234238 492 2 90U H he T
Charge
= 92
Total charge on right= 2 + 90 = 92
Charge
= 2
Charge
= 90
Element
symbol
234238 492 2 90U He Th
Mas
s
238 234492 2 90U He Th
Mas
s
Total mass on left = 238
234238 492 2 90U He Th
Mas
s
Total mass on left = 238
Total mass on right= 4 + 234 = 238
4 23423892 2 90U He Th
Mas
s
Total mass on left = 238
Total mass on right= 4 + 234 = 238
4 23423892 2 90U He Th
Mas
s
Total mass on left = 238
Total mass on right= 4 + 234 = 238
234238 492 2 90U He Th
Mas
s
Total mass on left = 238
Total mass on right= 4 + 234 = 238
234238 42 09 92U H he T
The Daughter Nucleus
238 4 23492 2 90U He Th
The Daughter Nucleus
The Parent Nucleus
An Alpha Particle
Alpha decay of uranium–238
238 4 23492 2 90H heU T
The Daughter Nucleus
The Parent Nucleus
Alpha decay of uranium–238
2 elements
down
Atomic number decreases by 2
238 4 234292 90U He Th
The Daughter Nucleus
The Parent Nucleus
Alpha decay of uranium–238
In an alpha decay, the atomic number of the daughter nucleus is always 2 less than the
atomic number of the parent nucleus.
Atomic # decreases by 2
238 234492 2 90U He Th
The Daughter Nucleus
The Parent Nucleus
Alpha decay of uranium–238
In an alpha decay, the mass of the daughter nucleus is always 4 less than the mass of the
parent nucleus.
Mass decreases by 4
Finding the Parent
Nucleus
218 4 21484 2 82Po He Pb
The daughter nucleus of an alpha decay is lead–214. Write the nuclear notation for the parent nucleus.
218 4 21484 2 82Po H be P
The daughter nucleus of an alpha decay is lead–214. Write the nuclear notation for the parent nucleus.
214218 484 2 82Po He Pb
The daughter nucleus of an alpha decay is lead–214. Write the nuclear notation for the parent nucleus.
214218 484 2 82Po He Pb
The daughter nucleus of an alpha decay is lead–214. Write the nuclear notation for the parent nucleus.
218 4 21422 884Po He Pb
The daughter nucleus of an alpha decay is lead–214. Write the nuclear notation for the parent nucleus.
218 4 21484 2 82Po He Pb
The daughter nucleus of an alpha decay is lead–214. Write the nuclear notation for the parent nucleus.
218 2144 8
428 2H bePo P
The daughter nucleus of an alpha decay is lead–214. Write the nuclear notation for the parent nucleus.
An alpha particle
218 4 21484 2 82Po He Pb
The daughter nucleus of an alpha decay is lead–214. Write the nuclear notation for the parent nucleus.
?
218 4 21484 2 82Po He Pb
The daughter nucleus of an alpha decay is lead–214. Write the nuclear notation for the parent nucleus.
?
218 4 2142 8284Po He Pb
The daughter nucleus of an alpha decay is lead–214. Write the nuclear notation for the parent nucleus.
Total charge on right= 2 + 82 = 84
218 4 2142 8284Po He Pb
The daughter nucleus of an alpha decay is lead–214. Write the nuclear notation for the parent nucleus.
Total charge on left= 84 Total charge on right
= 2 + 82 = 84
218 4 2142 8284Po He Pb
The daughter nucleus of an alpha decay is lead–214. Write the nuclear notation for the parent nucleus.
Total charge on left= 84 Total charge on right
= 2 + 82 = 84
The daughter nucleus of an alpha decay is lead–214. Write the nuclear notation for the parent nucleus.
218 4 21484 2 82He PbPo
The daughter nucleus of an alpha decay is lead–214. Write the nuclear notation for the parent nucleus.
polonium
Total charge on right= 2 + 82 = 84
The daughter nucleus of an alpha decay is lead–214. Write the nuclear notation for the parent nucleus. Total mass on right
= 4 + 214 = 218
4 21421884 2 82Po He Pb
The daughter nucleus of an alpha decay is lead–214. Write the nuclear notation for the parent nucleus. Total mass on right
= 4 + 214 = 218
4 21421884 2 82Po He Pb
Total mass on left= 218
The daughter nucleus of an alpha decay is lead–214. Write the nuclear notation for the parent nucleus. Total mass on right
= 4 + 214 = 218
4 214212 82
884Po He Pb
Total mass on left= 218
The daughter nucleus of an alpha decay is lead–214. Write the nuclear notation for the parent nucleus.
4 212 8 48
1284 2He PbPo
Nuclear notation for the Parent
Nucleus
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