Wed/Thurs Sept Objective: Predict what an element will decay into. Checkpoint: Homework: Half-life / Nuclear decay wksht (due Friday)

Is Nuclear Technology Worth It? Source A: Radium Girls (due Tues)

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Nuclear Chemistry When one element turns into another element

Band of Stability

Radioactive Decay

Half-Life The time it takes for half of a radioactive sample to decay. The half-life of Iodine-131 is 8 days.

Half-Life The time it takes for half of a radioactive sample to decay. The half-life of Iodine-131 is 8 days. 8 days

Half-Life The time it takes for half of a radioactive sample to decay. The half-life of Iodine-131 is 8 days. 16 days

Half-Life The time it takes for half of a radioactive sample to decay. The half-life of Iodine-131 is 8 days. 24 days

Half-Life The time it takes for half of a radioactive sample to decay. The half-life of Iodine-131 is 8 days. 32 days

Half-Life The time it takes for half of a radioactive sample to decay. The half-life of Iodine-131 is 8 days. 40 days

Half-Life The time it takes for half of a radioactive sample to decay. The half-life of Iodine-131 is 8 days. 48 days

Half-Life The time it takes for half of a radioactive sample to decay. The half-life of radioactive Uranium-238 is 4.46 billion years.

Half-Life The time it takes for half of a radioactive sample to decay. The half-life of radioactive Uranium-238 is 4.46 billion years billion years

Half-Life The time it takes for half of a radioactive sample to decay. The half-life of radioactive Uranium-238 is 4.46 billion years billion years

Half-Life The time it takes for half of a radioactive sample to decay. The half-life of radioactive Uranium-238 is 4.46 billion years billion years

Half-Life The time it takes for half of a radioactive sample to decay. The half-life of radioactive Uranium-238 is 4.46 billion years billion years

Half-Life The time it takes for half of a radioactive sample to decay. The half-life of radioactive Uranium-238 is 4.46 billion years billion years

Half-Life The time it takes for half of a radioactive sample to decay. The half-life of radioactive Uranium-238 is 4.46 billion years billion years

Cobalt–89 has a half–life of 9 years. How much of the substance would remain after 3 half–lives? (%) 100% 50% 1 half life (9 years) 25% 2 half lives (18 years) 12.5% 3 half lives (27 years)

Radon–222 has a half life of 3.2 days. How much radon–222 will remain after 9.6 days if you started with a 3.0 mg sample? 3.0 mg 1.5 mg 1 half life (3.2 days) 0.75 mg 2 half lives (6.4 days) mg 3 half lives (9.6 days)

The decay of cesium-137 has a half-life of 30 years. Approximately how many years must pass to reduce a 25 mg sample of cesium 137 to 8.7 mg? 25 mg 12.5 mg 1 half life (30 years) 6.25 mg 2 half lives (60 years) Between years, so approximately 50 years 8.7 mg

Types of Radiation Ionizing Radiation (can cause health problems) Non-ionizing Radiation (does not impact health) Electromagnetic Radiation Nuclear Radiation

My NotesYour Notes

Nuclear Notation: Subatomic Particles p 1 1 proton n 1 0 e 0 e 0 1 neutron electron positron

All elements after Bismuth (#83) are unstable Wrong proton/neutron ration

Write Bismuth in nuclear notation How many protons & neutrons? Bi protons 209 – 83 = 126 neutrons

U He 4 2 Th Th He 4 2 Ra

Pu He 4 2 U Np He 4 2 Pa

K e 0 Ca Bi e 0 Po Beta decay: Too many neutrons, not enough protons Solution: Get rid of an electron

N 13 7 e 0 1 C 6 C 11 6 e 0 1 B 5 Positron Emission: Too many protons, not enough neutrons Solution: Get rid of a positron

Cr e 0 V Electron Capture: Too many protons, not enough neutrons Solution: Capture an electron from electron cloud to nucleus Hg e 0 Au

Pb* Pb Gamma Decay: Too much energy Solution: Release energy in form of a gamma ray Hg* Hg

Thought of the Week I don’t believe you have to be better than everybody else. I believe you have to be better than you ever thought you could be. (Ken Venturi)