Geology Exam 3 Review

Geology Exam 3 Review - Geology Exam 3 Review Lecture 19...

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Geology Exam 3 Review Lecture 19 Isotopes – atoms of the same element have different numbers of neutrons in the nucleus o Stable – the particles making up their nuclei do not change with time o Unstable – the particles making up their nuclei DO change with time. Called radioactive isotopes Alpha Decay – 2 neutrons + 2 protons, each time an alpha particle is emitted from the nucleus, the mass number of the isotope is reduced by 4 and the atomic number is reduced by 2 (ex: uranium) Beta Decay – a single neutron in the nucleus breaks down into a proton and beta particle which can be thought of as an electron; the daughter nucleus has one more proton than the parent nucleus (ex: strontium); atomic number goes up by 1 and atomic mass number does not change Electron Capture – no particle is ejected, but energy is emitted; the mass number remains the same, but the atomic number drops by 1; turning original proton into a neutron (ex: potassium -> argon) Series Decay – series of steps between the parent isotope and a stable daughter isotope (ex: parent isotope: Uranium 283 at top and stable daughter: lead 206 at bottom) o Often called exponential decay – because when graphed, has exponential curve
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Geology Exam 3 Review - Geology Exam 3 Review Lecture 19...

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