The Periodic Table is the most important chemistry reference there is, and the cornerstone of science since 1869 when Dimitri Mendeleev perceived a totally new classification method and chart which he called "the periodic table". Check out many helpful pages on chemistry via the Periodic Table Sitemap.
The Periodic Table - Dimitri Mendeleev and the Periodic Table
Dimitri Mendeleev was the Russian author of the first periodic table and law. The modern Periodic table is based on his findings and theories in Periodic Chemistry. Click the following link for a chart containing the Periodic Table with names of the Elements.
Periodic Table History
Discover the brief History of the Periodic Table which details dates and the names of famous scientists and chemists who contributed to the development of the Periodic Table.
What is the Periodic Law?
The Periodic Law states that the properties of elements are periodic functions of their atomic weights. This is applied in the Periodic Table Chart.
The Periodic Table - What are Elements?
For the names of all the elements, together with their symbol, Atomic number and state (gas, solid or liquid) click here for the The Element Table Chart. An Element is a substance composed of atoms with the same atomic number. An element cannot be broken down in ordinary chemical reactions. Click this link for a chart containing the Periodic Table Names and Origins.
The Periodic Table - What are the Periodic Symbols?
Each element has a unique symbol. Periodic Symbols are international abbreviations for element names, usually consisting of the first one or two distinctive letters in element name. Some symbols are abbreviations for ancient names often taken from Greek or Latin. The Element Goldhas the symbol 'Au' which is taken from the Latin word 'aurum' meaning gold.
The Periodic Table - What is an Atomic Number
Each Chemical element is given a unique Atomic Number often referred to as a Periodic Table Number. For additional facts and information click here. We have included a Periodic Table with Atomic Mass.
The Periodic Table - Groups of Elements
The elements displayed on the Periodic Table are Gas, Liquid or Solid (called States of Matter) and are classified in Periodic Table Groups. Properties within each individual group are similar, but nevertheless vary within a group. Generally chemical activity decreases as the period increases a non-metal group and increases as the period increases within a metal group. The first element in a group is always an active metal, the last is always an inactive non-metal.
Names of the Periodic Table Groups
The elements displayed on the Periodic Table are Gas, Liquid or Solid and are classified in groups. The names of the Periodic Table Groups are Alkali Metals, Alkaline Earth Metals, Transition Metals, Metalloids, Other Metals, Non-Metals, Halogens, Noble Gases and Rare Earth Elements. Each of these classes, or groups, have common properties and characteristics. Nearly 75% of all the elements in the Periodic Table are classified as metals which are detailed in the List of Metals available here.
Interactive Periodic Table - Periods
The period of an element signifies the highest energy level an electron in that element occupies in an unexcited state. Generally, within a given period, the chemical activity of metals increases with the group number , while the chemical activity of non-metals within a given period decreases with the group number.
The Periodic Table - States of Matter
The States of Matter are either solid, liquid or gas. Most elements are solids, only 11 are gases and 2 are liquids. When a substance, like water, changes from one state or phase of matter to another it is referred to as a change of state or that it has undergone a change of phase which are detailed in our Phase Changes page.
The Periodic Table - Physical and Chemical Properties
The more Physical and Chemical Properties we can identify for a substance, the better we know the nature of the substance. Physical properties are the characteristics can be observed without changing the substance into another substance. Chemical properties are the characteristics that determine how it will react with other substances or change from one substance to another. Refer to Water Properties for additional facts and information about water
The Periodic Table *IOUPAC
The Periodic Table is based on the IOUPAC 1985 Standard. IOUPAC stands for the International Union of Pure Applied Chemistry. IOUPAC is an organization which sets international standards for chemical nomenclature, atomic weights, and the names of newly discovered elements. Click Here for a full list.
Chemical Formulas - Chemistry
Chemistry is the science of chemical elements and compounds and how these things work together - for more information see the Beginners Guide to Periodic Chemistry. A chemical element contains only one type of atom. If a substance contains more than one type of atom, it is a compound - see Examples of Compounds and different Types of Compounds.
Atoms - Chemistry
Atoms are made up of three kinds of smaller particles, called protons, neutrons and electrons. The atomic number, or Periodic Table Number, is the number of protons in the atom. We have created several unique charts detailing all of the elements in the Periodic table, the Number of Electrons, the Number of Protons, the Number of Neutrons, the Element Isotopes and the Mass Numbers of Atoms. Only a few atoms are capable of independent existence, therefore only a few atoms are molecules - see Molecules and Atoms information here.
Compounds - Chemistry
Chemical Formulas provide a type of shorthand for representing the elements in a compound. Examples of Chemical Formula and Equations provide a common chemical formula list and instructions on how to write a chemical formula or equation. Facts and definition, types, examples and rate of Chemical Reaction.
The Periodic Table Classification of Elements in the Periodic Table
The elements displayed on the Periodic Table are classified as:
- Alkali Metals
- Alkaline Earth Metals
- Transition Metals
- Other Metals
- Noble Gases
- Rare Earth Elements
The elements displayed on the chart may be accessed via the Periodic Table Elements Map.
Periodic Table - Names of the Periodic Table Elements classified as Metalloids
The 7 elements classified as "Metalloids" are located in Groups 13, 14, 15, 16 and 17 elements of the Periodic Table. Elements classified as Metalloids have properties of both metals and non-metals. Some are semi-conductors and can carry an electrical charge making them useful in calculators and computers.
The Names of the Metalloids on the Periodic Table are:
More information on Metalloids can be found here.
Periodic Table - Names of the Periodic Table Elements classified as Alkali Metals in the chart
The 6 elements classified as "Alkali Metals" are located in Group 1 elements of the Periodic Table. Elements classified as Alkali Metals are very reactive metals that do not occur freely in nature. Alkali metals are soft, malleable, ductile, and are good conductors of heat and electricity. The Names of the Alkali Metals are:
Names of the Periodic Table Elements classified as Alkaline Earth Metals in the chart
The 6 elements classified as "Alkaline Earth Metals" are located in Group 2 elements of the Periodic Table. Elements classified as Alkaline Earth Metals are all found in the Earth’s crust, but not in the elemental form as they are so reactive. Instead, they are widely distributed in rock structures. The Names of the Alkaline Earth Metals on the Periodic Table are:
Periodic Table - Names of the Periodic Table Elements classified as Transition Metals
The elements classified as "Transition Metals" are located in Groups 3 - 12 of the Periodic Table. Elements classified as Transition Metals are ductile, malleable, and conduct electricity and heat. The Names of the Transition Metals are:
The Periodic Table - Names of the Periodic Table Elements classified as Other Metals
The 7 elements classified as "other metals" are located in groups 13, 14, and 15 of the Periodic Table. All of these elements are solid, have a relatively high density and are opaque.
The Names of the "Other Metals" on the Periodic Table are:
The Periodic Table - Names of the Periodic Table Elements classified as Non-Metals
The 7 elements classified as "Non-Metals" are located in Groups 14,15 and 16 of the Periodic Table. non-metals are not easily able to conduct electricity or heat and do not reflect light. Non-metallic elements are very brittle, and cannot be rolled into wires or pounded into sheets. Non-metallic elements exist, at room temperature, in 2 of the 3 states of matter : Gases (such as Oxygen) and Solids (such as carbon).
The Names of the Non-Metals elements in the Periodic Table are:
The Periodic Table - Names of the Periodic Table Elements classified as Halogens
The 5 elements classified as "Halogens" are located in Group 7 of the Periodic Table. The term "halogen" means "salt-former" and compounds containing halogens are called "salts". The halogens exist, at room temperature, in all three states of matter - Gases such as Fluorine & Chlorine, Solids such as Iodine and Astatine and Liquid as in Bromine.
The Names of the Halogens elements in the Periodic Table are:
The Periodic Table - Periodic Table Elements classified as Noble Gases
The 6 elements classified as "Noble Gases" are located in Group 18 of the interactive Periodic Table.
The elements forming the Six Noble Gases on the Periodic Table are:
The Periodic Table - Periodic Table Elements classified as Rare Earth Elements
The elements classified as "Rare Earth Elements" are located in Group 3 of the Periodic Table and in the 6th and 7th periods. The Rare Earth Elements are of the Lanthanide and Actinide series. Most of the elements in the Actinide series are synthetic or man-made.
Dimitri Mendeleev and the History of the Periodic Table
Read about the History of the Periodic Table. Dimitri Mendeleev was born on February 7th 1834 in Tobolsk, a Town in Siberia. In 1869 at the age of 35 the famous Russian Scientist perceived a totally new classification Method "the periodic table", he included all the 65 elements known in his time by their atomic weights and chemical valency. Mendeleev then went even further, using the remaining gaps and spaces in his periodic table, he correctly concluded that a further group of yet unknown elements must exist in order to fill in the gaps in his Periodic Table, this group we now know as the lanthanides, and is Group six of our modern Standardised Periodic Table.
The Periodic Table - Interactive Periodic Table
Fifty years after Dimitri Mendeleev created the Periodic cable, the British scientist Henry Moseley discovered that the number of protons in the nucleus of a particular type of atom was always the same. When atoms are arranged via their Atomic Number, the few remaining problems with Mendeleev's original periodic table disappeared. Due to Moseley's work, the modern periodic table is based on the atomic numbers of the elements rather than atomic mass.
Dimitri Mendeleev's work on the Periodic Table chart recognised
Dimitri Mendeleev has clearly left his mark on modern science, indeed all modern Scientists are familiar with Standardised version of his Periodic table. Mendeleyev's homeland, Russia, has recognised the significance of his work by naming the "Mendeleyev University of Chemical Technology" in Moscow in his honour.
The Periodic Table IUPAC and the modern standardised Periodic Table Chart
The standardised periodic table in use today was agreed by the International Union of Pure Applied Chemistry, IUPAC, in 1985 and now recognises more periods and elements than Dimitri Mendeleev knew in his day but still all fitting into his concept of the "Periodic Table".
Interactive Periodic Table- Elements Map!
For additional information about the elements featured on the Interactive Periodic Table please refer to our comprehensive Elements Map!