periodic trends Flashcards
Dobereiner, what did he do?
Came up with triad
What is a traid?
3 elements with similar properties.
Li, Na, K
Groups/family on the periodic table
Newlands, what did he do?
Law of Octaves
What is the Law of Octaves?
Every 8th element, properties repeat.
Lothar Meyer, what did he do?
Arrangement of the elements by atomic mass, chemical properties repeat so many elements
Dmitri Mendeleev, what did he do?
:Arrangement by increasing atomic mass
:Published table (aka got the credit)
:Could predict unknown elements and properties
**left gaps
Henry Moseley, what did he do?
Arrangement by increasing atomic number
Periodic Law
When elements are order by atomic #, there is a periodic table pattern to their chemical/physical properties
All the different families on the periodic table
Alkali metals, Alkaline Earth metals, Inner transition metals, Transition metals, metalloids, Halogens, and noble gasses
Vertical Columns
Family/group
Rows
period/series
Metalloids
B, Si, Ge, As, Sb, Te, Po
Alkali Metals
1A,
unusually soft
Very reactive
Stored under a oil
Alkaline Earth Metals
2A
not as soft as Group 1A
react more mildly
only react with water when it steams (100c)
Halogens
7A
Unpleasant oder, will burn flesh
does not dissolve well in water
react with most metals and many non-metals
Noble Gasses
8A
not very reactive, very stable
not form compounds with other elements
Transition Metals
contain many every day metals
good electrical/heat conductors
ductile-can be stretched
Malleable-bent or shaped
Lustrous
Solid at room temp
Inner Transition metals
lanthanide series then
actinide series
Malleable
the ability to be easily changed into a new shape
Ductile
the ability to conduct electricity easily.
1A and 2A spell
Alkali metals and Alkaline Earth metals
