Chapter%2024-1

Chapter%2024-1 - Beta particles are somewhere in between Sg...

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Radioactivity 24.1
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Chapter 24 Recall Atomic Number (Z) Mass Number (N + Z) Be able to find number of protons, neutrons and electrons Often the atomic number is left off, why? Hg 201 80
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24.1 Radioactivity Some isotopes are radioactive, where the nucleus emits a particle Alpha particle (2 protons, 2 neutrons) Beta particle (1 electron, 0 p, 0 n) Gamma decay (nothing changes) α Sg Hs 4 2 273 106 277 108 + β Pm Nd 0 1 - 144 61 144 60 + γ Nd Nd 144 60 144 60 +
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24.1 Radioactivity Fun facts, we’re making new elements The top numbers on the left equal the top numbers on the right Same with the bottom numbers Write out reactions for: Alpha decay of Meitnerium-268 Beta decay of Platinum-198 β Pm Nd 0 1 - 144 61 144 60 +
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Other notes Gamma decay usually accompanies other types of radioactive decay Gamma are high energy photons, lethal and hard to stop (very penetrating) Alpha particles are least penetrating
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Unformatted text preview: Beta particles are somewhere in between Sg Hs 4 2 273 106 277 108 + + Other types of decay Positron emissions Electron capture (acts as a reactant) Pr Nd 1 144 59 144 60 + 1 e 1-Hg e Tl 204 80 1 204 81 +-More practice Write a reaction showing: Beta decay for Positron emission for Electron capture for I 128 53 Bi 212 83 Sb 122 51 Fun Facts The neutron to proton ratio (N/Z) can predict nuclear stability Around 1.0 1.2 for lighter atoms (Z < 40) Around 1.2 1.5 for heavier atoms (Z > 40) Atoms above these stable ratios generally undergo beta decay Atoms below these stable ratios generally undergo positron emission or electron capture All atoms with Z > 83 are unstable Often undergo alpha decay to quickly lower Z...
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Chapter%2024-1 - Beta particles are somewhere in between Sg...

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