chemistry

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Across
  1. 2. how much space an object takes up
  2. 7. an atom or molecule with a net electric charge due to the loss or gain of one or more electrons
  3. 11. energy that exhibits wave-like behavior and travels through space at the speed of light
  4. 15. amount of matter in an object
  5. 18. the tendency of an atom participating in a covalent bond to attract the bonding electrons
  6. 19. a nuclear reaction in which a heavy nucleus splits spontaneously or on impact with another particle, with the release of energy
  7. 20. the prefix for 1
Down
  1. 1. any of the gaseous elements helium, neon, argon, krypton, xenon, and radon, occupying Group 0 (18) of the periodic table. They were long believed to be totally unreactive but compounds of xenon, krypton, and radon are now known
  2. 3. any of the elements lithium, sodium, potassium, rubidium, cesium, and francium, occupying Group IA (1) of the periodic table. They are very reactive, electropositive, monovalent metals forming strongly alkaline hydroxides
  3. 4. electrons in the outermost shell, or energy level, of an atom
  4. 5. any of the set of metallic elements occupying a central block (Groups IVB–VIII, IB, and IIB, or 4–12) in the periodic table, e.g., iron, manganese, chromium, and copper. Chemically they show variable valence and a strong tendency to form coordination compounds, and many of their compounds are colored
  5. 6. any of the elements fluorine, chlorine, bromine, iodine, and astatine, occupying group VIIA (17) of the periodic table. They are reactive nonmetallic elements that form strongly acidic compounds with hydrogen from which simple salts can be made
  6. 8. negatively charged ions
  7. 9. electrons in their lowest energy state and are stable
  8. 10. a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign
  9. 12. a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids
  10. 13. an element or substance that is not a metal
  11. 14. a subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen
  12. 16. amount of mass within a certain amount of space
  13. 17. positively charges ions