“nucleus” (Ex. Carbon-14) VOCABULARY/RECAP ***Nuclide is another term for “nucleus” (Ex. Carbon-14) ***Radioactivity is the process by which materials give off rays of energy and particles. AGENDA 1) SPARK 2) SHARE OUT 3) LESSON 4) CLASS WORK 5) WRAP UP

VOCABULARY ***Radiation is the name for the rays or particles given off during the process of radioactivity. AGENDA 1) SPARK 2) SHARE OUT 3) LESSON 4) CLASS WORK 5) WRAP UP

VOCABULARY ***Elements with atomic numbers greater than 83 (Bismuth) have no known stable isotopes (all are radioisotopes). AGENDA 1) SPARK 2) SHARE OUT 3) LESSON 4) CLASS WORK 5) WRAP UP

changes into another element VOCABULARY ***Nuclear reactions are the cause of radioactivity. During nuclear reactions, the nuclei of unstable isotopes (radioisotopes) gain stability by giving off large amounts of energy while undergoing changes to gain stability. ***Transmutation – when an element changes into another element AGENDA 1) SPARK 2) SHARE OUT 3) LESSON 4) CLASS WORK 5) WRAP UP

HALF LIFE Half-life is the time required for one half of the initial amount of reactant to decay (react) to the product(s). AGENDA 1) SPARK 2) SHARE OUT 3) LESSON 4) CLASS WORK 5) WRAP UP

½ of the radioactive substance has decayed (transmuted). HALF LIFE In nuclear reactions, the half-life is when ½ of the radioactive substance has decayed (transmuted). Examples: Carbon-14 = 5715 years  I-131 = 8.021 days  U-238 = 4.47 x 10^9 years AGENDA 1) SPARK 2) SHARE OUT 3) LESSON 4) CLASS WORK 5) WRAP UP

HALF LIFE Graphing half-life shows that the substance decay is not a straight line (see misconception). AGENDA 1) SPARK 2) SHARE OUT 3) LESSON 4) CLASS WORK 5) WRAP UP

used to fight medical disorders. HALF LIFE Radioisotopes with long half lives are used to date dead organisms. Radioisotopes with short half lives are used to fight medical disorders. AGENDA 1) SPARK 2) SHARE OUT 3) LESSON 4) CLASS WORK 5) WRAP UP