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Word Count: 496
Elements are substances that cannot be broken down by chemical means There are 118 elements on the periodic table 92 of them occur naturally The periodic table organizes chemical elements in rows by the order of their atomic number Lead whose chemical symbol is Pb is an element that belongs to the carbon family on the periodic table Lead comes from the Greek word protos which means first It is a soft bluish-gray metal that is highly ductile and malleable This essay will discuss the discovery number of isotopes chemical properties uses abundance and dangers of leadThe thought of an element can stir an uprising of questions such as its discovery Unfortunately the date for the discovery of lead is unknown but scientists believe it is the oldest element However lead could be traced back to ancient Roman times The Romans had used lead for writing tablets coins and pipes carrying water When researching information about the element it might be useful to use the word plumbum instead of lead because that was the original name the Romans referred to it as What is an isotope An isotope is two or more forms of an element Lead has four naturally occurring isotopes known as Lead 2042 Lead 2063 Lead 2074 and Lead 208 Besides the number of isotopes there are other ways to name an element One way is by its atomic mass or the mass of an isotope of an element The atomic mass for lead is 2072 Another way to classify an element is by its atomic number An atomic number is the number of protons in the nucleus of an element Leads atomic number is 82Lead has some very distinctive chemical properties It is an active metal that does not burn quickly or react with oxygen It dissolves slowly in cold acids
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