Periodic Table
What is the periodic table? The periodic table is a rectangle that every one to day recognizes. This function of grouping the chemical elements was created by several European scientists; it all started in the 1860's. In 1863, a French geologist, A. E. Beguyer de Chancourtois created a list of the elements in the periodic table and arranged the elements by increasing atomic weight. The list was wrapped around a cylinder so that sets of similar elements lined up, creating the first representation of the periodic table. In England, a chemist by the name of John A. R. Newlands was also wrapping the elements, noticing that the chemical groups repeated after every eight elements. He named this the octave rule, and compared it to a musical scale. His work was considered to be absurd, so his work was ignored for years. Chemists Dmitrii I. Mendeleev, a Russian, and German Lothar Meyer were working independently to arrange the elements into seven columns, corresponding to various chemical and physical properties. Then latter came the periodic table as of to day to be what we see. Some of the parts of the modern periodic table are groups/families, and periods.There are many groups/families in the periodic table. The Alk
ali Metals are one of them. The Alkali Metals are the elements in Group IA of the periodic table. The members of the family are lithium, sodium, potassium, rubidium, cesium, and francium. All six elements have these properties the metals. Some of the prosperities are, they can be cut with a knife, they are the most reactive metals, they are so reactive that they are never found in nature, and they are always combined with other elements. Alkaline Earth Metals are beryllium, magnesium, calcium, strontium, barium, and radium. These elements have higher melting points and boiling points then the Alkali Metals. They are highly reactive, but not as much as the alkali metals. Like the alkali metals, the alkaline metals are never found free in nature they are also made by chemical means. Transition Metals have properties do not fit in with those of any other family. Most transition metals are very good conductors of heat and electricity. Most of these metals have high melting points. Many transition metals are combined chemically with oxygen to form compounds called oxides. Halogens are the elements in family VIIA. They are strongly and nonmetallic. The halogens include fluorine, chlorine, bromine, iodine, and astatine. The chemical reactivity of the halogens is due to the num
Some common words found in the essay are:
Noble Gasses, Transition Metals, , Alkali Metals, Lothar Meyer, John Newlands, Earth Metals, periodic table, alkali metals, noble gasses, transition metals, outermost electron, metals alkali metals, hand diagram, ionization energy, atomic radius, left period, remove outermost, alkali metals alkali, remove outermost electron,
Approximate Word count = 864
Approximate Pages = 3 (250 words per page double spaced)
|
