In the periodic table, you will find the atomic number on the upper left side of the symbol, while the mass number is assigned to the lower left side of the symbol.Ī specific element is differentiated from the remaining by its symbol (Fe for iron), unique atomic number (26 in case of iron), and mass number (55.8 for iron). As you refer to the labeled periodic table of elements with names, you will find elements along with their symbols, atomic number (represented by Z), and mass number (represented by A). For example, the element iron is made up of only iron atoms. An element is defined as a substance having only one type of atom. Every chemical matter is made up of one or more specific elements.
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