Science study guide

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Across
  1. 2. An area in an atom where electrons could possibly be found
  2. 4. A column of elements in the periodic table of the chemical elements
  3. 5. Happens when there are more protons than electrons in an atom
  4. 6. Property of metals and non metals
  5. 12. The emission of ionizing radiation or particles caused by the spontaneous disintegration of atomic nucleus
  6. 16. Any of a group of rare gases that include helium, neon, argon, krypton, xenon, and usually radon and that exhibit great stability and extremely low reaction rates
  7. 17. Can be solid, gas or liquid, cant conduct heat or electricity
  8. 18. Usually rigid, are good conductors of electricity and heat, form cations by loss of electrons, and yield basic oxides
  9. 19. Formed when an atom gains or loses electrons
  10. 20. The amount of protons in an element
  11. 21. Center of an aton containing protons and neutrons
  12. 23. Horizontal rows of the periodic table
  13. 24. Happens when there are more electrons than protons in an atom
Down
  1. 1. Positively charged particle that is part of an atom
  2. 3. Process by which an unstable atomic nucleus loses energy by radiation
  3. 7. Negatively charged particle that is part of an atom
  4. 8. Series of 15 consecutive chemical elements in the periodic table
  5. 9. Have superior abilities to conduct heat
  6. 10. Any of the chemical elements fluorine, chlorine, bromine, iodine, and astatine. They are all monovalent and readily form negative ions
  7. 11. No charge or neutral charged particle that is part of an atom
  8. 13. Two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons
  9. 14. Unit to measure weight of atoms
  10. 15. Earth metals are six chemical elements in group 2 of the table
  11. 20. Elements including sodium, potassium, lithium,rubidium, cesium, and francium
  12. 22. Any of the series of fifteen metallic elements