18 terms

Periodic Table

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periodic table
A table organizing all of the known elements by atomic number, weight, etc.
element
A pure substance made of only one kind of atom.
neutron
A subatomic particle that has no charge and that is found in the nucleus of an atom.
proton
A subatomic particle that has a positive charge and that is found in the nucleus of an atom.
electron
A subatomic particle that has a negative charge.
valance electrons
The number of electrons in the outermost energy level.
groups or families
Columns on periodic table.
periods
Horizontal rows in the periodic table.
malleable
Capable of being shaped or formed.
ductility
The ability of a substance to be pulled into a wire.
Alkali Metals
Group I on the periodic table. Highly reactive.
Alkaline Earth Metals
Elements in Group 2 on the periodic table and are very reactive.
Halogens
Are highly reactive nonmetals found in Group 17.
Noble Gases
Column 18; Most un-reactive group; Full outer shell.
Dmetri Mendeleeve
"Father of the Periodic Table"
atomic number
Number of protons
atomic mass
Number of protons and neutrons
atom
Smallest unit of an element.
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