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periodic table
na
11
Science
9th Grade
02/08/2012

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Term
Dmitri Mandeleev
Definition
known as the father of the modern periodic table
Term
atomic number
Definition
the number of protons
Term
periods
Definition
horizontal rows, physical and chemical properties repeat
Term
groups/families
Definition
vertical columns, tend to have some similar behaviors
Term
metals
Definition
typically shiny, ductile, malleable, and good conductors of heat and electricity
Term
nonmetals
Definition
do not have the properties of metals
Term
metalloids
Definition
have some of the properties of metals
Term
valence electrons
Definition
the electrons that are in the shell furthest away from the nucleus (the outermost shell)
Term
atomic radius
Definition
the distance from the center of the nucleus to the valence, or outer, electrons
Term
ionization energy
Definition
the amount of energy required to remove the most loosely held (outermost) electron from an atom in the gas state
Term
electronegavitity
Definition
the attraction an atom has fro the shared electrons in a bond
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