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Trends on the Periodic Table

Thursday, October 28, 2010 /10:44 PM

elements close to each other on the periodic table display similar characteristics
There are 7 important periodic trends

reactivity
ion charge
melting point
atomic radius
ionization energy
electronegativity
density

~Reactivity~

metals and non-metals show different trends
the most reactive metal is Francium; the most reactive non-metal is Fluorine

~Ion Charge~

elements ion charges depend on their group (column)

~Melting Point~

elements in the center of the table of the highest melting point
noble gases have the lowest melting points
starting from the left and moving right, melting point increases (until the middle of the table)

~Atomic Radius~

raidus decrease to the up and the right
helium has the smallest atomic radius
francium has the largest atomic radius

~Ionization energy~

ionization energy is the energy needed to completely remove an electron from an atom
it increases going up and to the right
all noble gases have high ionization energy
helium has the highest ionization energy
francium has the lowest ionization energy
opposite trend from atomic radius

~Electronegativity~

electronegativity refers to how much atoms want to gain electrons
same trend as ionization energy

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