Mendeleev's original periodic table organized elements in order of increasing atomic mass or weight. When a range is given, it's because the abundance of isotopes varies from one sampling location to another. Other tables include two numbers, which represent a range of values. Sometimes a periodic table cites a single value for atomic weight. The element's atomic mass in atomic mass units is a weighted average mass of the element's isotopes. Changing number of electrons produces ions while changing the number of neutrons produces isotopes. Variation in the number of electrons or neutrons does not change the type of element. The number of protons is the deciding factor when distinguishing one element from another. The atomic number is how many protons an atom of that element contains. The modern periodic table is organized in order of increasing atomic number. Usually, the symbol is an abbreviation of the element name, but some symbols refer to older names of the elements (for example, the symbol for silver is Ag, which refers to its old name, argentum). Each symbol is either one or two letters in length. In some cases, the abbreviation comes from the element's Latin name. Each element's cell typically contains lots of important information about that element.Įlement symbols are abbreviations of the element's name. The periodic table contains informative cells for each element arranged by increasing atomic number and chemical properties.
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