- •A Periodic Table of the Elements at Los Alamos National Laboratory
- •Hydrogen
- •Helium
- •Lithium
- •Beryllium
- •Boron
- •Carbon
- •Nitrogen
- •Oxygen
- •Fluorine
- •Neon
- •Sodium
- •Magnesium
- •Aluminum
- •Silicon
- •Phosphorus
- •Sulfur
- •Chlorine
- •Argon
- •Potassium
- •Calcium
- •Scandium
- •Tungsten
- •Zinc
- •Zirconium
- •Iron
- •Manganese
- •Antimony
- •Copper
- •Silver
- •Nickel
- •Chromium
- •Vanadium
- •Yttrium
- •Titanium
- •Molybdenum
- •Common Isotopes
- •Mercury
- •Cobalt
- •Lead
- •Gallium
- •Cesium
- •Rubidium
- •Germanium
- •Arsenic
- •Selenium
- •Bromine
- •Krypton
- •Strontium
- •Niobium
- •Technetium
- •Ruthenium
- •Rhodium
- •Palladium
- •Cadmium
- •Indium
- •Tellurium
- •Iodine
- •Xenon
- •Barium
- •Lanthanum
- •Hafnium
- •Tantalum
- •Rhenium
- •Platinum
- •Iridium
- •Osmium
- •Gold
- •Thallium
- •Bismuth
- •Polonium
- •Astatine
- •Radon
- •Francium
- •Radium
- •Actinium
- •Rutherfordium
- •Hahnium
- •Seaborgium
- •Nobelium
- •Neilsborium
- •Hassium
- •Meitnerium
- •Element 110
- •Element 111
- •Element 112
- •Mysterious Elements 114, 116, & 118
- •Cerium
- •Thorium
- •Europium
- •Praseodymium
- •Neodymium
- •Promethium
- •Samarium
- •Gadolinium
- •Terbium
- •Dysprosium
- •Holmium
- •Erbium
- •Thulium
- •Ytterbium
- •Lutetium
- •Protactinium
- •Uranium
- •Neptunium
- •Plutonium
- •Americium
- •Curium
- •Berkelium
- •Californium
- •Einsteinium
- •Fermium
- •Mendelevium
- •Lawrencium
- •Element Listing
- •Tell us or ask us
- •What is the Periodic Table?
- •How to Use the Periodic Table
- •Nutshell Chemistry
- •Mendeleev's Table
- •PERIODIC TABLE OF THE ELEMENTS
Mendeleev's Table
Mendeleev noted patterns in the combining ratios of elements
The Elements Lithium (Li), Sodium (Na), and Potassium (K) all formed oxides in the ratio of two atoms per oxygen atom: R2O
The Elements Beryllium (Be), Magnesium (Mg), and Calcium (Ca) all formed oxides in
the ratio of one atom per oxygen atom: RO Boron (B) and Aluminum (Al) formed R2O3
Carbon (C) and Silicon (Si) formed RO2
Recognizing the patterns of combining ratios or "valency", Mendeleev created a table organized by placing elements with similar combining ratios in the same group. He arranged the elements within a group in order of their atomic mass.
In 1869, the Russian chemist Mendeleev noted that the repeating patterns of behavior could be arranged in a sequence of elements giving rise to the "Periodic Table" of the elements.
Special thanks to Dr. Paul Karol's "Intro to Modern Chemistry" for providing much of the information on this page.
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Mendeleev's Table
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PERIODIC TABLE OF THE ELEMENTS
About this Resource
Originally this resource, the Periodic Table, was created by Robert Husted at Los Alamos National Laboratory during his time as a Graduate Research Assistant.
The Periodic Table that you are currently viewing was inherited by the Chemistry Division from the Computer Division who provided the laboratory some of the internets first web sites..
This page is being offered as a public service to all those wanting to become more educated in the field of Chemistry. This is an imperfect resource with ambiguities and errors. If you notice something incorrect about our web page we would be grateful for any pointers. We welcome any suggestions or comment at cstsupport@lanl.gov.
Good Luck, and Good Chemistry.
Chemistry Division
Computer Information Services Team
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