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LECTURE 1 CHAPTER 2 The nature of molecules

LECTURE 1 CHAPTER 2 The nature of molecules - The nature of...

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The nature of molecules CHAPTER 2
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Nature of Atoms All matter is composed of atoms All atoms are composed of protons, neutrons and electrons Atomic number is the number of protons in an atom Atomic mass is the sum of the masses of protons and neutrons
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Isotopes Isotopes - Atoms of an element that possess a different number of neutrons. Radioactive isotopes - Spontaneously decay into elements of lower atomic number. emit energy and/or subatomic particles Half-life refers to the amount of time necessary to decay half the atoms of a given sample.
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Carbon-12 6 Protons 6 Neutrons 6 Electrons Carbon-13 6 Protons 7 Neutrons 6 Electrons Carbon-14 6 Protons 8 Neutrons 6 Electrons
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Electrons Atoms with the same number of protons as electrons are electrically neutral. Ions - Atoms in which the number of protons and electrons differ. Cation - Contains more protons than electrons, and carries a positive charge.
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