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Radiometric Dating Half-life. Radioactivity Radioactive Isotopes are unstable and emit/capture elemental particles, causing them to change over time.

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Presentation on theme: "Radiometric Dating Half-life. Radioactivity Radioactive Isotopes are unstable and emit/capture elemental particles, causing them to change over time."— Presentation transcript:

1 Radiometric Dating Half-life

2 Radioactivity Radioactive Isotopes are unstable and emit/capture elemental particles, causing them to change over time. Parent isotope – the original radioactive element Daughter isotope – the decay product; what the parent changes into

3 Half Life The time it takes for EXACTLY HALF of the unstable, parent isotope to decay. This decay occurs at a CONSTANT RATE. The half life is NOT affected by: –Time –Concentration of parent isotopes –Heat/pressure –Breakage/Crushing

4 Decay 100% parent 1 half life 50 % parent 50% daughter 2 half lives 25% original parent 75% daughter 12.5% parent 87.5% daughter 3 half-lives 6.25% parent 93.75% daughter 4 half-lives

5 Decay Table Half Lives elapsed % parent remaining % daughter created

6 Decay HALF LIVES 100 % 50% 0% 25% 75% % of Original Parent

7 Types of Decay Alpha Decay – an atom emits 2 protons and 2 neutrons Atomic number and mass decrease

8 Types of Decay Beta decay – a neutron breaks into a proton and an electron…the electron is emitted atomic #, atomic mass unchanged

9 Types of Decay Electron capture – one electron is captured by the nucleus Atomic number increases by 1


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