Table Of The Elements Se ul Kee Jin Tadao He rmida S Er gio Cue Ger Ar do Lopez Ma rian Molina D

History Dimitri Mendeleev was the author of the 1 st periodic table. The modern one is based on his findings and theories in Periodic Chemistry.

History It is used by chemists to observe the chemical and physical properties, characteristics, patterns and relationships between over 100 elements in just one chart.

View Families or groups of elements are set in the columns (From 1 to 18 and the one of La and Ac). Periods are set in the rows (From 1 to 7). PFAMILIESORGROUPS E R I O D S

View lantanides 7actinides

Atomic number Elements are defined by the number of protons in their nucleus. All elements conform a perfect succession of integer numbers, from one to 118. (This is represented by Z). H 1

Each Chemical element on the Periodic table is given a unique Atomic Number. Atomic number

Atomic number in the table: just fill the blanks in increasing order

Atomic mass (A)

Electronic affinity

Electronegativity trend

Atomic Radii

Metals and non metals Besides the common ideas asociated with these classification (conductivity, shine, etc.) Chemical features (electronegativity, for instance) define this character, and are shown in the PT.

Families or groups: similar chemical behavior A group or family is a vertical column in the periodic table. Groups are considered the most important method of classifying the elements.

Families or groups: similar chemical behavior In most of the groups, the elements have very similar properties and exhibit a clear trend in properties down the group.

Families/groups

Periods The Periods in the Periodic Table are any of the 7 horizontal rows that contain elements arranged in order of increasing atomic number

Periods The Atomic number increases as you move across a period (row) Each period starts with Alkali metal and ends with a Noble gas The first element of each period (row) is most reactive and last element is chemically inert

The 18 Groups in the Periodic Table are any of the vertical columns that contain elements arranged in order of increasing atomic number The Atomic number increases as you go down (in the GROUP) Elements with similar properties are arranged in the same group

Blocks in the periodic table Each family or group shows identical electronic configurations in the last level.