Nuclear Decay (Radioactivity) Subatomic particles Electron -negatively charged particle found...
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Transcript of Nuclear Decay (Radioactivity) Subatomic particles Electron -negatively charged particle found...
![Page 1: Nuclear Decay (Radioactivity) Subatomic particles Electron -negatively charged particle found outside the nucleus. Proton – positively charged subatomic.](https://reader036.fdocuments.in/reader036/viewer/2022080901/56649e8b5503460f94b909fe/html5/thumbnails/1.jpg)
Nuclear Decay (Radioactivity)
![Page 2: Nuclear Decay (Radioactivity) Subatomic particles Electron -negatively charged particle found outside the nucleus. Proton – positively charged subatomic.](https://reader036.fdocuments.in/reader036/viewer/2022080901/56649e8b5503460f94b909fe/html5/thumbnails/2.jpg)
Subatomic particles
Electron -negatively charged particle found outside the nucleus.
Proton – positively charged subatomic particle found inside the nucleus.
Neutron – Neutrally charged (no charge) subatomic particle found inside the nucleus.
![Page 3: Nuclear Decay (Radioactivity) Subatomic particles Electron -negatively charged particle found outside the nucleus. Proton – positively charged subatomic.](https://reader036.fdocuments.in/reader036/viewer/2022080901/56649e8b5503460f94b909fe/html5/thumbnails/3.jpg)
Some Surprises
A neutron is a proton with a captured electron.
A neutron can become a proton by losing that electron.
That electron, when it comes flying out of the nucleus, will be called a beta particle. It’s symbol is the Greek letter β.
![Page 4: Nuclear Decay (Radioactivity) Subatomic particles Electron -negatively charged particle found outside the nucleus. Proton – positively charged subatomic.](https://reader036.fdocuments.in/reader036/viewer/2022080901/56649e8b5503460f94b909fe/html5/thumbnails/4.jpg)
Beta radiation
What would happen to the nuclear make-up as a result of beta radiation? Consider: carbon – 14.
+-+ -+
+
+
-+
-+-+
-+-+
++
+
-+ = neutron + = proton
![Page 5: Nuclear Decay (Radioactivity) Subatomic particles Electron -negatively charged particle found outside the nucleus. Proton – positively charged subatomic.](https://reader036.fdocuments.in/reader036/viewer/2022080901/56649e8b5503460f94b909fe/html5/thumbnails/5.jpg)
Beta radiation
What would happen to the nuclear make-up as a result of beta radiation? Consider: carbon – 14.
+-+ -+
+
+
-+
-+-+
-+ +
++
+
-+ = neutron + = proton
-
![Page 6: Nuclear Decay (Radioactivity) Subatomic particles Electron -negatively charged particle found outside the nucleus. Proton – positively charged subatomic.](https://reader036.fdocuments.in/reader036/viewer/2022080901/56649e8b5503460f94b909fe/html5/thumbnails/6.jpg)
Beta radiation
How many protons does it have now?
What is its mass number?
+-+ -+
+
+
-+
-+-+
-+ +
++
+
-+ = neutron + = proton
![Page 7: Nuclear Decay (Radioactivity) Subatomic particles Electron -negatively charged particle found outside the nucleus. Proton – positively charged subatomic.](https://reader036.fdocuments.in/reader036/viewer/2022080901/56649e8b5503460f94b909fe/html5/thumbnails/7.jpg)
Alpha Radiation
An alpha (α) particle is the same as a helium nucleus and is therefore symbolized by: He4
2
![Page 8: Nuclear Decay (Radioactivity) Subatomic particles Electron -negatively charged particle found outside the nucleus. Proton – positively charged subatomic.](https://reader036.fdocuments.in/reader036/viewer/2022080901/56649e8b5503460f94b909fe/html5/thumbnails/8.jpg)
-+ = neutron
+-+ -+
+
+
-+
-+-+
-+-+
++
+
+ = proton
+-+
+-+
+-+
+-+ +
-++-++-+
+-+
+-+
+-+
+-+
+-+
+-+
+-+
+-+
+-+
+-+
+-+
![Page 9: Nuclear Decay (Radioactivity) Subatomic particles Electron -negatively charged particle found outside the nucleus. Proton – positively charged subatomic.](https://reader036.fdocuments.in/reader036/viewer/2022080901/56649e8b5503460f94b909fe/html5/thumbnails/9.jpg)
Alpha Decay
When an alpha particle is emitted from a nucleus, what is left? Consider Uranium – 238.
23892 U X + He4
2Th23490
![Page 10: Nuclear Decay (Radioactivity) Subatomic particles Electron -negatively charged particle found outside the nucleus. Proton – positively charged subatomic.](https://reader036.fdocuments.in/reader036/viewer/2022080901/56649e8b5503460f94b909fe/html5/thumbnails/10.jpg)
Which kind of decay is represented by each change?
I – 130 → Xe – 130 Am-241 → Np-237
![Page 11: Nuclear Decay (Radioactivity) Subatomic particles Electron -negatively charged particle found outside the nucleus. Proton – positively charged subatomic.](https://reader036.fdocuments.in/reader036/viewer/2022080901/56649e8b5503460f94b909fe/html5/thumbnails/11.jpg)
Three Kinds of Decay
Alpha – a helium nucleus, cannot penetrate paper.
Beta - an electron which is emitted from the nucleus. Can penetrate paper, but cannot penetrate aluminum foil.
Gamma ray – not a particle. 50% emitted will penetrate 1cm of lead.