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Section 1-2 Matter and Its Properties
Section 1-2 Matter and Its Properties

...  An atom is the smallest unit of an element that maintains the properties of that element.  An element is a pure substance made up of only one kind of atom.  A compound is a substance that is made from the atoms of two or more elements that ...
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... indicates that the electron is bound to the nucleus. If the energy were to become positive, then the electron would no longer be a bound particle and the total energy would no longer be quantized. The quantized energy of the electron is a result of it being bound to a finite region. For hydrogen-lik ...
Chap 7 - HCC Learning Web
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... electrons are in the same group and thus will have similar chemical properties (see chapter 2). Another method is by adding the electrons altogether to get the total electron number which is same as the atomic number or say proton number in an atom. Then locate its symbol and location in the periodi ...
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... Algorithmic means that, he suggests, it is not programmable on a computer. He suggests that you can prove that consciousness is more than a very large computer program on a very large computer. Humans have 100 billion neurons in their brain. The neuron is basically a single cell that receives charg ...
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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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