Atoms are the smallest subject of matter or life. They are 4 thousand millionths of an inch across. An atom weighs about 4 trillionths of a trillionth of an ounce.
If you split an atom it makes a bomb. That bomb is the atomic bomb. It was invented in 1919 in New Zealand by British physicist Emest Rutherford. The word atomic comes from the word atom.
Click here for a diagram of an atom: http://www.chem4kids.com/atoms/structure.html
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