Periodic Table
chart used to organize known elements by their chemical properties
Periodic Table of Elements
one, two, or three letter abbreviation for an element
Chemical Symbol
Group 1 of the Periodic Table of Elements; highly reactive, soft, and brittle
Alkali Metals
elements that share characteristics with metals and nonmetals
Metalloids
horizontal row on the Periodic Table of Elements. All of the elements in a period have the same number of electron orbitals
Period
the number of protons found in the nucleus of one atom of an element
Atomic Number
Group 2 of the Periodic Table; combine with elements from the Halogens to form salts
Alkaline Earth Metals
elements that are not malleable, not ductile, are poor conductors, and do not have luster
Nonmetals
vertical column on the Periodic Table of Elements. All of the elements in a group have similar chemical properties
Group
the combined number of protons and neutrons found in the nucleus of one atom of an element
Mass Number
hard, malleable, and ductile metals with variable oxidation states; Transition Metals are good conductors of heat and electricity
Metals
non-reactive gases. Their valence electron orbitals are full and complete
Noble Gases
describes how easily an element will bond with other elements
Reactivity
how many electrons an element tends to give away or receive when bonding
Oxidation Number
elements found at the bottom of the Periodic Table of Elements; many are radioactive
Rare Earth Elements
The smallest noble gas.
Helium