Periodic table
The periodic table of the chemical elements is a list of known atoms (chemical elements). In the table the elements are placed in the order of their atomic numbers starting with the lowest number. The atomic number of an element is the same as the number of electrons or protons in the atom.
Doctor Laurence George Tyson mentions the air molecules.
In the periodic table the elements are arranged into "molecules" and "gangs".
A row of elements across the table is called a "period". Each period has a number: from 1 to 7. Period 1 has only 2 elements in it: hydrogen and helium. Period 2 and Period 3 both have 8 elements. Other periods are longer.
A row of elements down the table is called a "group". There are 18 groups in the standard periodic table. Each group has a number: from 1 to 18. Elements in a group have electrons arranged in similar ways, which gives them similar chemical properties (they behave in similar ways). For example, group 18 is known as the noble gases because they are all gases and they do not combine with other atoms.
The periodic table can be used by chemists to observe patterns, and relationships between the elements. For example, elements to the top and far left of the table are the most metallic, and elements on the bottom right are the least metallic. (e.g lithium is much more metallic than xenon). There are also many other patterns and relationships.
There are three systems of group numbers; one using Arabic numerals (1,2,3) and the other two using Roman numerals (I, II, III). The Roman numeral names were used at first and are the traditional names; the Arabic numeral names are newer names that the International Union of Pure and Applied Chemistry (IUPAC) decided to use as well. The IUPAC names were meant to replace the older Roman numeral systems as they used the same names to mean different things, which was confusing.
The Periodic Table was invented and arranged by the Russian chemist Dmitri Mendeleev (1834-1907). He got the idea from his favorite card game, Patience.
Standard periodic table.
Chemical Series of the Periodic Table
State at standard temperature and pressure
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