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Content Mastery
Overview
Properties
of Atomsandthe
Periodic
Table'
Directions: Completethe conceptmap using the terms in the list below. Termscanbeusedmorethan once.
protons'
electrons
periodictable
neutrons
Atoms
have a mass
number equal to
the sum of
are made up of
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are organized
as elements in the
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thecorrect
wordsinpar~ntheses.
7. An element is matter that is composed of one type of (atom/quark).
8. The unit of measurement used for atomic particles is the
(atom size/atomic mass unit).
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9. Atoms of the same element that have different nuIribers of neutrons are called
.(isotopes/ electron clouds).
10: In the periodic table, elements are arranged by increasing atomic (power/number).
11. An electron dot diagram usesthe symbol of an element and dots to represent
the (quarks/electrons) in the outer energy level.
"t
Properties
ofAtomsandthePeriodic
Table 19
Name
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Date
-.
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Directed Reading for
Content Mastery
Class
Sed ion 1 . Structule,oftfte
Atom
Sedion2. MassesofAtoms
't
Directions: Usethetermsbelowto completethefollowingparagraphsaboutatoms,atomicmass,and
isotopes.Termsmaybeusedmorethanonce.
six
number
n~utron(s)
electrons
proton(s)
isotopes
mass
quarks
The electron has very little mass compared to the
2.
. The mass of the atom
many 3.
electron'cloud
sixprotons
1.
or
depends on the nucleus and how
and 4.
it has.The sum of the
protons and neutrons is the mass 5.
of an atom. The number
of neutrons in an atom canbe found by subtracting the atomic number from the
6.
number. The massof the atom is sosmall that there is a
measure called the atomic
8.
7.
unit designated by amu.
and9.
of 10.
make up the nucleusand are made up
. There are 11.
t
uniquely
are found in an area around the nucleus called
different quarks. 12.
the 13.
. The
nuclei of all atoms of a given element always have the
same number of 14.
. They will also have the same number of
15.
around-the nucleus. Some atoms-may have more or fewer
16.
than will other atoms of the same element Atoms of the same
element with different numbers of neutrons are calledTt~
atom of carbon must contain 18.
. Every
but some contain six neutrons and
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20
PropertiesofAtomsandthe PeriodicTable
Date
Name
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Directed Reading for
Content Mastery
KeyTerms
PropertiesofAtomsandthe
t
PeriodicTable
Directions: Matchthetermin Column/I withthe definitioninColiJmn
I. Writetheletterofthe correcttermin
theblankat the/eft.
Column I
Column II
1. sum of the number of protons and
neutrons in the nucleus
2. region around the nucleus where the
electrons are found
3. positivelycharged center of an atom
a. nucleus
b. electrons
c. protons
d. neutrons
4. vertical column in the periodic table
5. neutral particlesoin'thenucleus of an atom
6. weighted averagemass of the mixture of
its isotopes
7. positivelycharged particles in an atom
8. table
of the elements arranged, according
to repeated changes in properties
9. represents the electrons in the outer
energy levelof an element
10. negativelycharged particles in an atom
11. atoms of the same element that have
different numbers of neutrons
12. number of protons in an atom's nucleus
e. quark
f. atomic number
g. mass number
h. isotope
i. average atomic mass
j. electron
cloud.
k. periodic table
1. atom
m. atomic mass unit
13. horizontal row in the periodic table
n. group
14. smallest known particl~ that makes
up protons and neutrons
o. electron dot diagram
15. the smallest peice of matter that still
retains the properties of the element
p. period
16~ developed an early periodic chart
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22
Properties of Atoms and the Periodic Table
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Enrichment
an Element's
Predicting..
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Group and Period
Severalscientists,including Newlands, Meyer, and Mendeleevworked on classificationsystems
that grouped elements accordingto their properties. They found that these properties repeated in a
regular or periodic manner. This fact was used to predict properties of undiscovered elements.
Reviewelectron arrangement from your textbook.In Table I, write.the maximum number of
electrons that can fill each energy level on the blanks in the table heading. Write the total number
of electrons for each element in the first column labeled Total.For each element, assignthe correct
number of electrons to each energy level. Complete Table2 by using the information from the six
elementsstudied.
.
.
Table1
Electrons
Element.
Total
Level 1
Level 3
Level 2
1. Argon
2. Carbon
3. Helium
.
4. Lithium
t
5. Silicon
6. Sodium
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Element
Energy
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Number of
Located in
period
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group
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13. How is the element's period related to the number of energy levels over which its electronsare
spread?
14. How can you predict an element's group and period?
32
Properties of Atoms and the Periodic Table
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