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History of the Periodic Table: Difference between revisions
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The modern periodic table has more than the 63 elements that were discovered by Mendeleev. Most of the periodic tables up to this date have up to 109 elements. It has 18 groups in vertical columns. The vertical columns are labeled by roman numerals or numbers, and each horizontal row is called a period, and the periodic table consists of seven periods. <ref>GENESIS. [https://genesismission.jpl.nasa.gov/educate/scimodule/cosmic/explore_2ST.pdf Cosmic Chemistry: An Elemental Question] ''Genesis Education''. Accessed May 21, 2017.</ref> On the left and middle side of the table there are the elements that are metals. On the right side are the nonmetals, groups 13-18. The metalloids are adjacent to the stair-step line on the table. On the bottom of the table are the tow rows of elements called the lanthanide series and the actinide series. The atomic number increases from left to right along the whole periodic table, and become less metallic. | The modern periodic table has more than the 63 elements that were discovered by Mendeleev. Most of the periodic tables up to this date have up to 109 elements. It has 18 groups in vertical columns. The vertical columns are labeled by roman numerals or numbers, and each horizontal row is called a period, and the periodic table consists of seven periods. <ref>GENESIS. [https://genesismission.jpl.nasa.gov/educate/scimodule/cosmic/explore_2ST.pdf Cosmic Chemistry: An Elemental Question] ''Genesis Education''. Accessed May 21, 2017.</ref> On the left and middle side of the table there are the elements that are metals. On the right side are the nonmetals, groups 13-18. The metalloids are adjacent to the stair-step line on the table. On the bottom of the table are the tow rows of elements called the lanthanide series and the actinide series. The atomic number increases from left to right along the whole periodic table, and become less metallic. | ||
== Element Families == | |||
There are eighteen distinct families in the periodic table. One example is the alkali metal family consists of all the elements in the periodic table that are very chemically reactive. The elements are lithium, sodium, potassium, rubidium, cesium, and francium. These metals conduct electricity easily and have a bright and shiny surface. They all react easily with water. Alkali metals are most commonly used in streetlights, soap, rayon, and paper. There are many more families. The transition metals, inner transition metals, post-transition metals and the metalloids, carbon, nitrogen, oxygen, halogen, and nobles gases. | |||
== Facts About the Periodic Table == | == Facts About the Periodic Table == | ||
