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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. | ||
== Facts About the Periodic Table == | |||
* There are ninety elements in the periodic table that are found in nature, the rest are man-made. | |||
* Most of the elements in the periodic table are metals | |||
* The main difference between Mendeleev's periodic table and the modern periodic table is that Mendeleev's table has the elements arranged by increasing atomic weight, and the modern periodic table has the elements arranged by increasing atomic number. | |||
* The first element to be made artificially was Technetium. https://www.thoughtco.com/important-periodic-table-facts-608854 | |||
==References== | ==References== | ||
