Periodic Table Research Paper

By: Andrew Barton

Periodic Table of Elements The periodic table was created in 1869 by Dmitri Mendeleev. He developed the table to illustrate the trends in properties of then known elements. The periodic tables purpose is to summarize the properties of real elements. Dmitri Mendeleev also arranged the elements known at the time in order of relative atomic mass. Today there are 118 elements on the periodic table; Mendeleev’s version had only 63 elements on it. The first scientific discovery of an element was phosphorous. Other Metals is a group that consists of 7 elements. Other metals are special because unlike transition metals the other metals don’t exhibit a variable oxidation state. They are also solid and have a high density, they

There are 17 rare earth elements that are considered to be rear earth metals. They are Scandium and yttrium and the fifteen lanthanides. Scandium and yttrium are both transition metals and rare earth metals because they are usually found with the rare earth metal deposits. The rare earth elements contribute to technologies people rely on today. They make possible the high tech world we live in today. Non Metals are elements on the periodic table that are not metal. Non-metals are the elements in groups 14-16 on the periodic table. There are 18 elements in the category non metals. Non-metals cannot conduct electricity or heat very well. As opposed to metals, non-metal elements are very brittle, and cannot be rolled into wires. The non-metals exist in two of the three states of matter at room temperature gases and solids.

Alkali Metals are made up of six different elements and are found in group one on the periodic table. These metals have only one electron in their outer shell. This means they are ready to lose that one electron in ionic bonding with other elements. As with all metals, the alkali metals are malleable, ductile, and are good conductors of heat and electricity. The alkali metals are softer than most other metals. Cesium and francium are the most reactive elements in this group. Alkali metals can explode if they are exposed to

These five toxic, non-metallic elements make up Group 17 of the periodic table.Fluorine and chlorine are gases. Bromine is one of only two liquid elements. Iodine is a solid. Astatine is radioactive and is one of the rarest of the chemical elements.

Alkaline Earth Metals IS made up of six elements. It’s the second group on the periodic table. All alkaline earth metals have an oxidation number of +2, making them very reactive. Because of their reactivity, the alkaline metals are not found in nature.All of the Alkaline earth metals except magnesium and strontium have at least one naturally occurring radioisotope

Noble Gases is made up of six elements on the periodic table which are in the last group on the periodic table. There are actually now seven elements in the noble gases. Because they have the newest element which is called ununoctium. These elements were considered to be inert gases until the 1960's, because their oxidation number of zero prevents the gases from forming compounds readily. All noble gases have the maximum number of electrons possible in their outer shell making them