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atom a very small particle that makes up most kinds of matters and
atom a very small particle that makes up most kinds of matters and

Physical Science Test #1 – Review Guide Properties of Matter
Physical Science Test #1 – Review Guide Properties of Matter

... 19. A __________________________ is made up of more than one kind of atom or molecule in the same place at the same time (but those atoms or molecules are NOT bonded together). 20. ________________________________ are made up of one kind of atom; for example: carbon, oxygen, hydrogen, sodium, or chl ...
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uncertainty, atom

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... People have come to realize that the matter of the world is made from a few fundamental building blocks of nature. The word "fundamental" is key here. By fundamental building blocks we mean objects that are simple and structureless -not made of anything smaller. Even in ancient times, people sought ...
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Reactions I Can..

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Unit 1 – Physical Science and Chemical Reactions

< 1 ... 729 730 731 732 733 734 735 736 737 ... 788 >

Atomic theory



In chemistry and physics, atomic theory is a scientific theory of the nature of matter, which states that matter is composed of discrete units called atoms. It began as a philosophical concept in ancient Greece and entered the scientific mainstream in the early 19th century when discoveries in the field of chemistry showed that matter did indeed behave as if it were made up of atoms.The word atom comes from the Ancient Greek adjective atomos, meaning ""uncuttable"". 19th century chemists began using the term in connection with the growing number of irreducible chemical elements. While seemingly apropos, around the turn of the 20th century, through various experiments with electromagnetism and radioactivity, physicists discovered that the so-called ""uncuttable atom"" was actually a conglomerate of various subatomic particles (chiefly, electrons, protons and neutrons) which can exist separately from each other. In fact, in certain extreme environments, such as neutron stars, extreme temperature and pressure prevents atoms from existing at all. Since atoms were found to be divisible, physicists later invented the term ""elementary particles"" to describe the ""uncuttable"", though not indestructible, parts of an atom. The field of science which studies subatomic particles is particle physics, and it is in this field that physicists hope to discover the true fundamental nature of matter.
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