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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.
Slide 2 of 52
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>Distinguishing Among Atoms Atomic Number4.3
© Copyright Pearson Prentice Hall
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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.
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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SAMPLE PROBLEM
Slide 6 of 52
4.1
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Slide 7 of 52
End Show
for Sample Problem 4.1
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>Distinguishing Among Atoms4.3 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 _______
_______________.
Slide 9 of 52
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>Distinguishing Among Atoms Isotopes
Despite these differences, isotopes are
_____________ _______________ because
they have identical numbers of ___________
and _______________________.
4.3
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Slide 10 of 52
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Slide 11 of 52
End Show
for Conceptual Problem 4.2
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© 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
Slide 13 of 52
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>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
Slide 14 of 52
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>Distinguishing Among Atoms Atomic Mass
Weighted Average Mass of a Chlorine Atom
4.3
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Slide 15 of 52
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Slide 16 of 52
End Show
for Conceptual Problem 4.3
for Conceptual Problem 4.3
© 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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SAMPLE PROBLEM
Slide 18 of 52
4.2
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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.
Slide 20 of 52
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>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
Slide 21 of 52
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>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
Slide 22 of 52
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>Distinguishing Among Atoms The Periodic Table—A Preview
A Period
4.3
Slide 23 of 52
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>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
Slide 24 of 52
© Copyright Pearson Prentice Hall
>Distinguishing Among Atoms The Periodic Table—A Preview
A Group or Family
4.3