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Chapter 2 reals

Chapter 2 reals - Chapter2 18:12 CambrianSystem Atom=

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Chapter 2 18:12 2Look at notes for up to pg 30 Cambrian System Fossiliferous sequence of rocks- exposures of these strata provided a standard section  against which other rocks on Europe and other continents could be correlated. Principles of Radiometric Dating Atom=smallest particle of matter that can exist as a chemical element Consists of nucleus- protons + and neutrons Electrons orbit nucleus- negatively charged Ions Most atoms are neutral with number of protons equaling electrons If unequal # of protons and electrons the atom has a charge and is called an ion Atomic number Number of protons in the nucleus Mass number Sum of the number of protons plus neutrons Mass number may vary for an element because of a differing number of neutrons Isotopes Elements with various numbers of neutrons are called isotopes of that element Ex u 235 and u 238 Some isotopes are unstable and they undergo radioactive decay, releasing particles of  energy Some elements have both radioactive and non radioactive isotopes What happens when atoms decay? Radioactive decay occurs by releasing subatomic particles and energy The radioactive parent element is unstable and undergoes radioactive decay to form a  stable daughter element
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