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CORC 1322 MAIN PAGE

MATTER

Introduction
Atoms and Molecules

ATOMIC STRUCTURE

Introduction
Electrons
Protons
Neutrons

REACTIONS

Introduction
Bonds and Octet Rules
Chemical Equations
The Mole

SOLVING PROBLEMS

Density
Conversions

VISUAL AIDS

Functional Groups
Periodic Table

QUIZZES

Practice Quiz I
Practice Quiz II
Practice Quiz III

Periodic Table of the Elements

Scientists use the periodic table to classify the various elements that make up all matter in the universe.  

Below is an interactive periodic table with all 118 known elements known to man.  If you click on the atomic symbol of any element, you will learn its chemical name and other information about its physical properties.

Group
1A
2A
3A
4A
5A
6A
7A
8A
I
II
III
IV
V
VI
VII
VIII
IX
X
XI
XII
XIII
XIV
XV
XVI
XVII
XVIII
Period

1
H He
2
Li Be
Transition Metals
B C N O F Ne
3
Na Mg

Al Si P S Cl Ar
4
K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr
5
Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe
6
Cs Ba *La Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn
7
Fr Ra **Ac Rf Db Sg Bh Hs Mt Uun Uuu Uub Uut Uuq Uup Uuh Uus Uuo
*Lanthanide Series
Ce Pr Nd Pm SmEu Gd Tb Dy Ho Er Tm Yb Lu
**Actinide Series
Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr
Name Atomic Number Atomic Mass (Mass Number )
Melts Freezes
     


Legend
Metals
A solid substance that is a good conductor of heat and electricity; can be formed into many shapes
Nonmetals
A poor conductor of heat and electricity; not easily formed into shapes
Metalloid
"Middle elements" - conduct heat and electricity better than nonmetals, but not as well as metals; easier to shape than nonmetals, but not as easy as metals; solid at room temperature
Noble
Gases
Nonmetals but with with stable electron configurations; poor conductors of heat and electricity; resist reacting with other elements and being formed into shapes

The modern periodic table is organized by atomic structure. There are two main aspects of the periodic table: rows, which are called periods and columns, which are called groups.

The period in which an element appears reflects the number of main electron shells, or energy levels, in an atom of that element.  So sulfur (S), which is in the third period, has three main occupied electron shells.

The group number for the main set of elements (the A group) indicates the number of electrons in the valence shell.  Therefore, sulfur, a member of group 6A, has six valence electrons.  The B group of elements, the transition metals, are not studied in Core Studies 7.1.

Russian chemist, Dmitrii I. Mendeleev, created the periodic table in 1869. Mendeleev organized his table in seven columns, placing elements with similar chemical and physical properties in the same column. Although it has been over 130 years since Mendeleev first created his periodic table, the table scientists use now is not very different from the original.