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Home
Science
Chemistry
🧑🏾🔬
The Periodic Table
Creators
Döbereiner (1857) - triads
Ca, Sr, Br
Newlands (1863) - arranged by increasing at. mass
Noted repetition of properties every 8th element
Law of Octaves - seven groups of 7
Mendelev (1865) - First periodic table
Arranged by increasing at. mass
Left spaces for undiscovered elements
Noted recurring physical changes
Mosely (1913) - arranged by increasing at. number
Found nuclear charge
\
Groupings
Period/Series - horizontal rows
Row number tells the outer Energy level of the element
Same number of Energy levels
Group/Family - vertical columns
Similar physical and chemical properties
Families
1A to 8A - Representative Elements
Same number of valence electrons
Similar electron configurations
1A Alkali Earth Metals
Doesn't include H
Most reactive metals
1 valence electron
Low density, low melting point'
Good conductivity
Soft, shiny metals
Very malleable, ductile
Combine with H2O to form a strong base
Explode in H2O
Exothermic reaction
Heat explodes Hydrogen
2A Alkaline Earth Metals
2 valence electrons
Higher density than 1A
Good conductivity
Gray/white
rapid oxidation
Used in structural materials
6A Chalogen Family
Also called Oxygen Family
6 valence electrons
gain electron
forms anion
7A Halogens
7 valence electrons
Always combined in nature
8A Noble Gases
Unreactive
8 valence electrons
He has 2 electrons
full outer E levers
S and P are full
Types of Elements
Metals
left of zigzag; few outer electrons
Tend to lose electrons (cation)
Hard, shiny, malleable, good conductors
Metal reactivity increases down and to the right
Nonmetals
Right of zigzag; many outer electrons
tend to gain electrons
brittle solids, insulators, dull
nonmetal reactivity increases up and to the right
Metalloid
touching zigzag on a side
characteristics of metals and nonmetals
Doesn’t include Aluminum
Promotion
Chromium Family
Cr - Chromium
Mo - Molybdenum
W - Tungsten
Precious Metals
Cu - Copper
Ag - Silver
Au - Gold
Fill partially filled sub level to become half filled
More stable
Oxidation Numbers
Octet Rule - atoms with 8 outer electrons are stable
elements try to reach this
oxidation numbers - apparent changes elements have when they react
All Transition Metals are +2
fill d sub level
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undefined Flashcards
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Explore Top Notes
SAT Expert Strategies and Principles
Note
Studied by 68 people
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11-02: Quadratic Functions
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Studied by 20 people
5.0
(1)
In the time of the butterflies- Julia Alvarez analysis guide
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Studied by 37 people
5.0
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Chapter 3 - Planting Colonies in North America
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Studied by 25 people
5.0
(1)
Literary Device Glossary
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Studied by 8 people
5.0
(1)
The Ultimate Guide to AP United States Government and Politics
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Studied by 113762 people
4.9
(376)