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© Copyright Pearson Prentice Hall Distinguishing Among Atoms > Slide 1 of 52 4.3 Atomic Number Elements are _____________ because they contain ___________ ___________ of ______________. The ____________ ______________ of an element is the ____________ of ________________ in the __________ of an atom of that element.
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Slide 2 of 52 © Copyright Pearson Prentice Hall > Distinguishing Among Atoms Atomic Number 4.3
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© Copyright Pearson Prentice Hall Slide 3 of 52
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© Copyright Pearson Prentice Hall Slide 4 of 52 Practice Problems for Conceptual Problem 4.1 Problem Solving 4.15 Solve Problem 15 with the help of an interactive guided tutorial.
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Slide 5 of 52 © Copyright Pearson Prentice Hall > Distinguishing Among Atoms Mass Number The total number of _________ and ________ in an atom is called the ________ __________. The number of _______________ in an atom is the ____________ between the _________ number and ____________ number. 4.3
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© Copyright Pearson Prentice Hall SAMPLE PROBLEM Slide 6 of 52 4.1
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© Copyright Pearson Prentice Hall Slide 7 of 52 End Show for Sample Problem 4.1
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Slide 8 of 52 © Copyright Pearson Prentice Hall > Distinguishing Among Atoms 4.3 Isotopes _____________ are atoms that have the same number of _______________ but different numbers of ______________. Because isotopes of an element have different ________ of __________, they also have different _______ _______________.
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Slide 9 of 52 © Copyright Pearson Prentice Hall > Distinguishing Among Atoms Isotopes Despite these differences, isotopes are _____________ _______________ because they have identical numbers of ___________ and _______________________. 4.3
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© Copyright Pearson Prentice Hall Slide 10 of 52
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© Copyright Pearson Prentice Hall Slide 11 of 52 End Show for Conceptual Problem 4.2
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Slide 12 of 52 © Copyright Pearson Prentice Hall > Distinguishing Among Atoms Atomic Mass It is useful to to compare the relative masses of atoms to a standard reference isotope. Carbon- 12 is the standard reference isotope. Cabon-12 has a mass of exactly 12 atomic mass units. An __________ _____________ __________ (amu) is defined as one twelfth of the mass of a ___________-____ atom. 4.3
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Slide 13 of 52 © Copyright Pearson Prentice Hall > Distinguishing Among Atoms Atomic Mass The ________ ________________ of an element is a ___________ ________ ___________ of the atoms in a naturally occurring sample of the element. A weighted average mass reflects both the ___________ and the ___________ _____________ of the isotopes as they occur in nature. 4.3
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Slide 14 of 52 © Copyright Pearson Prentice Hall > Distinguishing Among Atoms Atomic Mass Weighted Average Mass of a Chlorine Atom 4.3
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© Copyright Pearson Prentice Hall Slide 15 of 52
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© Copyright Pearson Prentice Hall Slide 16 of 52 End Show for Conceptual Problem 4.3
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© Copyright Pearson Prentice Hall Distinguishing Among Atoms > Slide 17 of 52 Atomic Mass To calculate the atomic mass of an element, multiply the ___________ of each isotope by its _________ ______________, expressed as a decimal, and then _________ the products. 4.3
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© Copyright Pearson Prentice Hall SAMPLE PROBLEM Slide 18 of 52 4.2
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© Copyright Pearson Prentice Hall Slide 19 of 52 Practice Problems for Sample Problem 4.2 Problem Solving 4.24 Solve Problem 24 with the help of an interactive guided tutorial.
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Slide 20 of 52 © Copyright Pearson Prentice Hall > Distinguishing Among Atoms The Periodic Table—A Preview A periodic table is an arrangement of elements in which the elements are separated into groups based on a set of repeating properties. A periodic table allows you to easily compare the properties of one element (or a group of elements) to another element (or group of elements). 4.3
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Slide 21 of 52 © Copyright Pearson Prentice Hall > Distinguishing Among Atoms The Periodic Table—A Preview Each ____________ row of the periodic table is called a ____________. Within a given period, the ___________ of the elements __________ as you move ___________ it from element to element. 4.3
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Slide 22 of 52 © Copyright Pearson Prentice Hall > Distinguishing Among Atoms The Periodic Table—A Preview A Period 4.3
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Slide 23 of 52 © Copyright Pearson Prentice Hall > Distinguishing Among Atoms The Periodic Table—A Preview Each ____________ column of the periodic table is called a _____________, or family. Elements within a ______________ have ____________ chemical and physical properties. 4.3
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Slide 24 of 52 © Copyright Pearson Prentice Hall > Distinguishing Among Atoms The Periodic Table—A Preview A Group or Family 4.3
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