Chemistry

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  1. 1. number - A set of real numbers assigned to a physical system that individually characterize the properties and collectively specify the state of a particle or of the system.
  2. 5. Principle- Used to determine the electron configuration of an atom, molecule, or ion.
  3. 7. - A stable, positively charged subatomic particle having a mass 1,836 times that of the electron.
  4. 9. exhibit a simple multiple relation
  5. 10. - One of two or more atoms having the same atomic number, but different mass numbers, due to a different number of neutrons in the nucleus.
  6. 11. number - The sum of the number of neutrons and protons in an atomic nucleus.
  7. 15. Rule - If two or more orbitals of equal energy are available, electrons will occupy them singly before filling them in pairs.
  8. 16. - Greek philosopher who did not follow the teachings of Democritus. He believed in the four earthly elements (fire, earth, air, and water), and proposed a fifth heavenly element (aether).
  9. 17. of Multiple Proportions - law stating that when two elements can combine to form more than one compound the amounts of one of them that combines with a fixed amount of the other wi
  10. 19. - Study of spectra, especially experimental observation of optical spectra.
  11. 20. of Definite Proportions - elements composing a compound are always present in the same proportions by mass
  12. 21. - (born c. 460 — died c. 370 BC) Greek philosopher. Though only a few fragments of his work survive, he was apparently the first to describe invisible "atoms" as the basis of all matter. His atoms — indestructible, indivisible, incompressible, uniform, and differing only in size, shape, and motion — anticipated with surprising accuracy those discovered by 20th-century scientists.
  13. 24. - (born 1766 - died 1844) English scientist who was one of the first to decide that all matter is made up of small particles, or atoms.
  14. 25. A unit of matter, the smallest unit of an element having all the characteristics of that element and consisting of a dense, central, positively charged nucleus surrounded by a system of electrons.
Down
  1. 2. - An electrically neutral subatomic particle having a mass 1,839 times that of the electron.
  2. 3. - A proton or a neutron, especially as part of an atomic nucleus.
  3. 4. - The wave function of an electron in an atom or molecule, indicating the electron’s probable location.
  4. 6. - Greek word meaning indivisible or not able to be cut
  5. 8. Exclusion Principle - No two electrons may simultaneously occupy the same quantum state.
  6. 12. - One or more orbitals in the electron shell of an atom.
  7. 13. of Conservation of Mass - The notion that mass, or matter, can be neither created nor destroyed. According to conservation of mass, reactions and interactions which change the properties of sub
  8. 14. leave unchanged their total mass; for instance, when charcoal burns, the mass of all of the products of combustion, such as ashes, soot, and gases, equals the original mass of charcoal and the oxygen with which it reacted.
  9. 18. - The quantum of electromagnetic energy, regarded as a discrete particle having zero mass, no electric charge, and an indefinitely long lifetime.
  10. 22. - (born 1871 - died 1937) New Zealand physicist who named the nucleus and proton and won the 1908 Nobel prize in chemistry
  11. 23. - A stable subatomic particle having a rest mass of 9.1066 × 10 -28grams