Note
5.0
(1)
Rate it
Take a practice test
Chat with Kai
undefined Flashcards
0 Cards
0.0
(0)
Explore Top Notes
Invisible Man Chapter 21
Note
Studied by 16 people
5.0
(1)
ALL OF HEIMLER'S VIDEOS (APWH)
Note
Studied by 69295 people
4.6
(71)
Evaluating Learning Styles
Note
Studied by 11 people
5.0
(1)
4.1 - Technological Innovations: 1450-1750
Note
Studied by 52 people
5.0
(1)
(Reader2) Personalgewinnung/Rekrutierung
Note
Studied by 2 people
5.0
(1)
Geometry: Unit 10 Circles- Tangents, Chords, Arcs, Angles
Note
Studied by 1780 people
4.9
(7)
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
Note
5.0
(1)
Rate it
Take a practice test
Chat with Kai
undefined Flashcards
0 Cards
0.0
(0)
Explore Top Notes
Invisible Man Chapter 21
Note
Studied by 16 people
5.0
(1)
ALL OF HEIMLER'S VIDEOS (APWH)
Note
Studied by 69295 people
4.6
(71)
Evaluating Learning Styles
Note
Studied by 11 people
5.0
(1)
4.1 - Technological Innovations: 1450-1750
Note
Studied by 52 people
5.0
(1)
(Reader2) Personalgewinnung/Rekrutierung
Note
Studied by 2 people
5.0
(1)
Geometry: Unit 10 Circles- Tangents, Chords, Arcs, Angles
Note
Studied by 1780 people
4.9
(7)