TOPIC: Radioactivity TOPIC: Radioactivity Do Now: Take out your notes from Monday, and get ready for...
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Transcript of TOPIC: Radioactivity TOPIC: Radioactivity Do Now: Take out your notes from Monday, and get ready for...
TOPIC: Radioactivity
Do Now: Take out your notes from Monday, and get ready for an open notebook quiz
Not all isotopes are stable
Stable isotopes have…
1:1 ratio of n0 to p+ (for elements <20)
1.5:1 ratio of n0 to p+ (for elements >20)
To determine if an isotope is stable or unstable (radioactive) – compare the number of protons to neutrons
Beyond Element 83 are very unstable (radioactive)
• No amount neutrons can hold nucleus together once it has 83+ protons
• All Elements 83 and above on PT are radioactive
• Other elements may have radioactive isotopes applet
Radioisotopes- unstable nucleus – they are radioactive
the nucleus of element emits radioactive particles and/or electromagnetic waves…by emitting these particles,nucleus changes into different element (it’s trying to become more stable)
Radioactive Decay Series
• Sometimes 1 change isn’t enough to achieve stability
• Some radioisotopes go through several changes before they achieve stability (and are no longer radioactive)
U-238 PB-206