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chapter 2 powerpoint_ - The Nature of Molecules Chapter 2 1...

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1 The Nature of Molecules Chapter 2
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2 Outline Structure of Atoms Isotopes Radioactive Isotopes Electrons and Chemical Behavior Chemical Bonds Ionic versus Covalent Water Chemistry Hydrogen Bonding pH
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3 Atoms All matter is composed of atoms . Protons (+) and neutrons (neutral) are found on the atom’s nucleus, while electrons (-) circle the nucleus. Atomic number - number of protons Atoms with the same atomic number belong to the same element, and thus have the same inherent properties.
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4 Atoms
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5 Atomic Weight Mass refers to the amount of a substance. Weight refers to the force exerted on a substance by gravity. Atomic mass of an atom refers to the sum of the masses of protons and neutrons. measured in Daltons
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6 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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7 Electrons Atoms with the same number of protons as electrons are electrically neutral. Ions
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This note was uploaded on 10/20/2010 for the course PSYCH 101 taught by Professor Wyllie during the Fall '08 term at Delgado CC.

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chapter 2 powerpoint_ - The Nature of Molecules Chapter 2 1...

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