Presentation is loading. Please wait.

Presentation is loading. Please wait.

CHAPTER 24 Nuclear Energy

Similar presentations


Presentation on theme: "CHAPTER 24 Nuclear Energy"— Presentation transcript:

1 CHAPTER 24 Nuclear Energy
I. Radioactivity (p ) 1 1

2 A. Definitions Radioactivity
emission of high-energy radiation from the nucleus of an atom Nuclide nucleus of an isotope Transmutation process of changing one element into another via nuclear decay

3 B. Nuclear Decay Why nuclides decay…
to obtain a stable ratio of neutrons to protons Stable Unstable (radioactive)

4 C. Half-life Half-life (t½)
time it takes for half of the nuclides in a sample to decay Example Half-lives polonium seconds lead hours iodine days carbon-14 5,370 years uranium billion years

5 D. Half-life total time = 30 hours number of half-lives = 2
How much of a 20-g sample of sodium-24 would remain after decaying for 30 hours? Sodium-24 has a half-life of 15 hours. GIVEN: total time = 30 hours t1/2 = 15 hours original mass = 20 g WORK: number of half-lives = 2 20 g ÷ 2 = 10 g (1 half-life) 10 g ÷ 2 = 5 g (2 half-lives) 5 g of 24Na would remain.


Download ppt "CHAPTER 24 Nuclear Energy"

Similar presentations


Ads by Google