title: An Introduction to the Periodic Table of Elements : Chemistry Textbook Grade 8 | Children's Chemistry Books
author:  Baby Professor 
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  called “lead” in a pencil), coal, charcoal, and diamonds are
  different forms of the element carbon.
  Elements can be identified by their names or their
  chemical symbols, which are abbreviations of the modern
  or Latin names of the elements. Each element is also iden-
  tified by its own number, which is based on the structure
  of its subunits, or atoms. The periodic table is a chart
  used by chemists to organize and describe the elements.
  Appendix 3 shows the periodic table and gives some in-
  formation about how it is used. Table 2-1 lists some ele-
  ments found in the human body along with their
  functions.
  Atoms
  The subunits of elements are atoms. These are the
  smallest complete units of matter. They cannot be broken
  down or changed into another form by ordinary chemical
  and physical means. These subunits are so small that
  millions of them could fit on the sharpened end of a
  pencil.
  Atomic Structure Despite the fact that the atom is
  such a tiny particle, it has been carefully studied and 