NUCLEAR DAY 2 Alexia Denice eddie Shomari Cabinets

NUCLEAR DAY 2

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Do now 1. REACTION CHEMICAL NUCLEAR Cancer treatment Digesting food Burning fossil fuels Radioactive dating The sun generating heat and light 2. Fusion or Fission: Hydrogen nuclei are fused in the Sun to make helium atoms. 3. Fusion or Fission: Radium-226 decays to radon-222. 4. Strong nuclear forces affect which part of the atom? 5. Which of the following causes radioactivity? a. Strong nuclear b. Gravity c. Weak force d. Electromagnetic forces

Agenda Go over chemical/nuclear Go over fusion/fission Go over 4 forces Learn about radioactive decay & Daily Expectations SHOULD BE WORKING ON-TOPIC NO HEADS DOWN

4 forces (strong weak) Strong nuclear force : holds middle of atom (protons/neutrons) Electromagnetic force : Weak : causes holds electrons some forms of radioactivity; atomic decay Gravity : causes all things with mass to attract

Nuclear vs chemical reactions Nuclear reaction Results in the fusion (combining) or fission (splitting) Chemical reaction Results in the atoms breaking or forming bonds

What is RADIOACTIVITY? ? Radioactive decay occurs in unstable atomic nuclei –due to an excess of either protons or neutrons. This unstable nucleus will then release energy or a particle known as radiation

Effects on the Human Body Measured in Sieverts(Sv) Comparing Exposures Background Radiation Chances of Death Based on Exposure Level Symptoms Yes! High levels will cause extreme mutations and disfigurement!

Types Radioactivity High energy photon Gamma Radiation

For Your Information MASS 4 He 2 ATOMIC NUMBER ****this determines what element it is – use the periodic table!

Alpha decay If an atom releases an alpha particle, it will be positively charged mass number decreases by four and atomic number decreases by two units. Example : 238 4 He + 234 Th U → 92 2 90 Very damaging! Paper exposed to constant alpha radiation would break down.

Beta decay If an atom releases an beta particle, it will be negatively charged mass number stays the same and atomic number increases by one unit. Example : 238 4 He + 234 Th U → 92 2 90 It takes a small aluminum plate to stop most beta particles.

Gamma decay If an atom releases a gamma particle, it will have no charge mass number stays the same and atomic number stays the same. Example : 238 4 He + 234 Th U → 92 2 90 This radiation has no charge, and can penetrate most matter easily, requiring lead bricks for shielding.

Penetrating Power

Videos! https: //www. youtube. com/watch? v=WMXhk_SATTc https: //www. youtube. com/watch? v=TRL 7 o 2 k. Pqw 0 Title: MOST RADIOACTIVE PLACES ON EARTH 1. What have you learned? 2. What would like to know about?

We do Put alpha or beta decay for each transformation:

Partner practice expectations C– HAMPS- on topic; no disturbances ask your partner then me partner practice none make sure you are working success with decay problems!