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Models of the Atom
Models of the Atom

... – Only specific frequencies are allowed – And, hence, only certain energy levels ...
Final Exam Review Answers
Final Exam Review Answers

Bohr Model and Principal Quantum Number
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... CPS Question • J. J. Thomson: – A: found that negative electricity was transported by tiny particles – B: found the first particles smaller than the hydrogen atom – C: found that negative electricity particles were always exactly the same, regardless of the materials used to make the electrodes or ...
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Physics Notes for Class 12 Chapter 12 Atoms

... (i) About the Stability of Atom According to Maxwell’s electromagnetic wave theory electron should emit energy in the form of electromagnetic wave during its orbital motion. Therefore. radius of orbit of electron will decrease gradually and ultimately it will fall in the nucleus. (ii) About the Line ...
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... 12. The law of conservation of mass states that matter cannot be made or destroyed by ordinary chemical means. Explain what is meant by this statement. 13. Who is Democritus and what did he believe? How about the early Greeks? 14. John Dalton created an atomic theory in the early 1800’s. It has been ...
Vocabulary Notes
Vocabulary Notes

... The mass of one mole of substance. The term Formula Wt. is a general term. More specific terms are molar mass, atomic weight, & molecular weight. Eg. The mass of NaCl = 58.45 g/mol ...
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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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