EOG REVIEW

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EOG REVIEW 8th grade SCIENCE
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GOAL 4
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Unit D Chapter 1.2 pages D17 D23
Elements Make up the Periodic Table
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periodic table
a table of the elements, arranged by atomic
number, that shows the patterns in their
properties
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DMITRI MENDELEEV

• In 1869, Dmitri Mendeleev, a Russian chemist,
  made the first periodic table.
  There were only 63 known elements
• We call it the periodic table because it shows
  a periodic, or repeating, pattern
  of properties of the elements.

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group               
1
2

• a vertical column in the periodic table of the
  elements

• elements have similar
• properties

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period               

• a horizontal row in the periodic table of the
  elements

• elements have varying properties

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How to Read the Periodic Table
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Each SQUARE of the periodic table gives
particular information about the atoms of the
element.
1
20
2 8 8 2
2
Ca
Calcium
40.078
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Each SQUARE of the periodic table gives
particular information about the atoms of the
element.
1
20
2 8 8 2
K
ATOMIC NUMBER
2
L
M
Ca
ELEMENT SYMBOL
N
Calcium
ELEMENT NAME
ELECTRON SHELLS
40.078
ATOMIC MASS
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Atomic Info
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1. atomic of Chlorine 2. atomic mass of
Boron 3. protons in Na atom 4.
neutrons in He atom 5. electrons in Cl
atom 6. atomic mass of Chlorine 7.
neutrons in Na atom 8. atomic mass of Helium
atom
10.81 or 11
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2
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35.453 or 35
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4.003 or 4
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ATOMIC DIAGRAM 1
1) atomic number 11
2) protons 11
3) electrons 11
4) atomic mass number 23
K
5) neutrons 12
6) electron shells 3
L
7) period 3
8) group 1
M
9) element name sodium
10) element symbol Na
11) metal, metalloid, nonmetal? metal
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ATOMIC DIAGRAM 2
1) atomic number 17
2) protons 17
3) electrons 17
4) atomic mass number 35
K
5) neutrons 18
6) electron shells 3
L
7) period 3
8) group 17
M
9) element name chlorine
10) element symbol Cl
11) metal, metalloid, nonmetal? nonmetal
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THE END