Unit 1: Atomic Concepts

Atoms have only been known to exist for less than 100 years! Remember that while you are learning the concepts in this unit. It has taken humans hundreds of years of research and experiments to find out the nature of the smallest particles that make up each of the 118 known elements. Individual atoms are so small that in an average 70 kilogram human there are are almost 7X10^27 atoms! On average, 87% of the atoms in the body are Hydrogen or Oxygen. Carbon, Hydrogen, Nitrogen, and Oxygen together account for 99% of the atoms in a person.
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  Oct 3, 2014, 12:38 PM Joe Minutillo
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