A chemical element (or element) is a chemical substance consisting of atoms having the same number of protonsin their atomic nuclei (i.e. the same atomic number, Z). There are 118 elements that have been identified, of which the first 94 occur naturally on Earth with the remaining 24 being synthetic elements. There are 80 elements that have at least one stable isotope and 38 that have exclusively radioactive isotopes, which decay over time into other elements. Iron is the most abundant element (by mass) making up the Earth, while oxygen is the most common element in the crust of the earth. This book discusses the origin and classifications of The Chemical Elements and is designed to be a general overview of the topic and provide you with the structured kwledge to familiarize yourself with the topic at the most affordable price possible. The level of discussion is that of Wikipedia. The accuracy and kwledge is of an international viewpoint as the edited articles represent the inputs of many kwledgeable individuals and some of the most currently available general kwledge on the topic, based on the date of publication.
The editor has degrees in Engineering Physics & Nuclear Engineering from the University of Michigan and is an Engineer & Former Intelligence Officer for the CIA & US Intelligence Community and was President of an award-winning Defense Contracting Company. He has authored several books, edited numerous other books and has written many Technical, Classified & Unclassified papers, Articles & Essays. He has also been a Contributing Author for The International Encyclopedia on Intelligence and Counter-Intelligence and written several award-winning software manuals that have been sold in more than a dozen countries. He has appeared in Marquis Who's Who in the World & Who's Who in Science & Engineering and continues to edit and write.