What,are,atoms,For,thousands,y education What are atoms
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For thousands of years,men have written and guessed about the nature of tiny particles likethese, but they did not have any real idea of what an atom is like.Thinking men in ancient Greece, including one named Democritus, 2,500years ago, asked this question: What would happen if you should cut apiece of iron into smaller and still smaller pieces? You wouldfinally get to a particle so small that you could not cut it further.They called this imaginary particle the atom, which in the Greeklanguage meant "uncuttable." But they did not have any realidea of what an atom is like. Then, about 1 50 yearsago, an Englishman named John Dalton made a great step forward. Infact, he really started the science that has become modern chemistry.The ancient Greeks were on the right track, he said; all matter iscomposed of atoms, and there are different kinds of atoms, one kindfor iron and another kind for gold and a different kind for eachother chemical element. But all the atoms of one kind are exactlyalike. All iron atoms are the same, all gold atoms are the same, andso on. Because of this, chemistswere able to find out how the weight of one atom compares with theweight of a different atom. It would be impossible to weigh a singleatom, because it is too small it takes billions of atoms to makean ounce. But we know now that hydrogen, which is a gas, has thelightest atom; that oxygen, the life-giving gas in the air, weighsabout 16 times as much as hydrogen, and that iron weighs about 56times as much. The "atomic weight" of every element isknown in the sameway.
What,are,atoms,For,thousands,y