4B = Section 2 The Structure
of Atoms p 119-127
(Question 14-17 will be on
4B quiz, too.)
Physical Science
08-09 Curriculum
3/17/2016
PhSci Ch 4 17 Questions
1
Give the relative masses of
protons, neutrons & electrons


Protons & neutrons have about the
same mass;
Electrons are over 1, 000 times
smaller (in mass than protons &
neutrons). 
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http://en.wikipedia.org/wiki/File:Atomic_resolution_Au100.JPG
PhSci Ch 4 17 Questions 19
slides
2
Give what defines each element

The number of protons 
http://en.wikipedia.org/wiki/Subatomic_particle
3/17/2016
PhSci Ch 4 17 Questions
3
Explain why most (unreacted)
atoms do not have an overall
charge if they are made of charged
particles



Most atoms have an equal number
of protons and electrons
whose charges exactly cancel. 
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PhSci Ch 4 17 Questions
4
Define ion



an atom
who has gained or lost an electron
and therefore ( ) is charged. 
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PhSci Ch 4 17 Questions
5
Explain what holds atoms together



Attractions
between the opposite charges
of protons and electrons 
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PhSci Ch 4 17 Questions
6
Explain how different elements
have their own unique properties



The atoms
of each type of element
have their own different structure 
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PhSci Ch 4 17 Questions
7
Define atomic number

how many protons are in an atom 
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PhSci Ch 4 17 Questions
8
Give the largest naturally occurring
element and its atomic number


Uranium,
92 
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PhSci Ch 4 17 Questions
9
Define mass number



Tells the number of protons
plus the number of neutrons
in an atom. 
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PhSci Ch 4 17 Questions
10
Define isotope



An atom
that has the same number of protons
but a different number of neutrons.

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PhSci Ch 4 17 Questions
11
Define radioisotopes




Unstable isotopes
which emits radiation
and decays into stable forms
(this might take a long time and
many steps). 
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PhSci Ch 4 17 Questions
12
Define unified atomic mass unit



A quantity used to measure the mass
of atoms
(which is equal to 1/12 of a carbon12 atom)
And is abbreviated u. (Sometimes
called an amu) 
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PhSci Ch 4 17 Questions
13
Define average atomic mass



average of the mass
of an element’s atoms found in nature
where common isotopes are more
important 
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PhSci Ch 4 17 Questions
14
Define valence electrons

Electrons in the outer energy level of
an atom http://www.chem4kids.com/files/elem_transmetal.html
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PhSci Ch 4 14 Questions 18
slides
15
*** Using a periodic table, give the
# of protons, neutrons, &
electrons of various atoms
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PhSci Ch 4 17 Questions
16
*** Calculate atomic number &
mass number
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PhSci Ch 4 17 Questions
17
*** Write isotopes using the forms
given on p 124 (Fig 5 and in the
reading)
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PhSci Ch 4 17 Questions
18

The end
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PhSci Ch 4 17 Questions
19