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Classifying the elements - Coggle Diagram
Classifying the elements
Groups and Periodic table
Facts + Important
Mendeleeve (1989) : proposed
special element
Hydrogen : smallest atom of all + distinctive/unique properties
cause
Doesn't fit any trend in any group
properties (3)
elements : arranged in order of increasing proton (atomic number) (left-> right; up to down)
groups :: vertical columns : elements + similar properties
Causes (2)
Smilar physical & (chemical properties)<= same electrons in outer energy levels (electronic configuration) (mainly)
Horizontal rows (=periods)
more unreactive metal/non-metal : centre of periodic table
Groups
Main
elements in group I-> VIII : main-group elements
G1+2
reactive metal : group 1 (alkali metal) - most reactive; group 2 (alkaline earth metals) (2 columns in left)
transition elements
hard, strong, dense metals (middle + Sc, Y) + form coloured compound (4)
Metalloids
(= semi-metals) (á kim) semiconductors (ex: silicon, germanium)
properties
(+some properties of metals + more characteristic of non-metals (look like metals + brittle like non-metals)
The halogens : group 7
The noble gases (group 8)
(very unreactive ~ inert + stable)