GAMS Atoms and the Periodic Table Review

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Across
  1. 5. A charged particle that forms when an atom or group of atoms gains or loses one or more electrons.
  2. 7. An interaction that holds atoms or ions together.
  3. 9. The region around the nucleus of an atom where electrons are likely to be found.
  4. 14. The law that states that mass cannot be created or destroyed in ordinary chemical and physical changes.
  5. 17. The smallest unit of an element that maintains the properties of that element.
  6. 18. A atom's central region, which is made up of protons and neutrons.
  7. 19. The law that states that the repeating chemical and physical properties of elements change periodically with the atomic numbers of the elements.
  8. 20. A vertical column of elements on the periodic table; elements in a group share chemical properties.
  9. 22. The mass of an atom expressed in atomic mass units.
  10. 23. A subatomic particle that has no charge and that is found in the nucleus of an atom.
  11. 24. The combining of atoms to form molecules or ionic compounds.
  12. 25. A substance or molecule that participates in a chemical reaction.
  13. 26. The number of protons in the nucleus of an atom; the atomic number is the same for all atoms of an element.
  14. 27. An atom that has the same number of protons (atomic number) as other atoms of the same element do but that has a different number of neutrons, and thus a different atomic mass.
  15. 29. One of the elements of Group 18 of the periodic table; elements of Group 18 are nonreactive due to a full outer energy level. (He, Ne, Ar, Kr, Xe Rn)
  16. 30. A subatomic particle that has a positive charge and that is found in the nucleus of an atom.
Down
  1. 1. In chemistry, a horizontal row of elements on the periodic table.
  2. 2. A bond that forms when electrons are transferred from one atom to another, which results in a positive ion and a negative ion.
  3. 3. An electron that is found in the outermost shell of an atom and that determines the atom's chemical properties.
  4. 4. Describes something that occurs or repeats at regular intervals.
  5. 6. A subatomic particle that has a negative charge.
  6. 8. Bond - A bond formed when atoms share one or more pairs of electrons.
  7. 10. One of the elements of Group 1 of the periodic table. (Li, Na, K, Rb, Cs, Fr)
  8. 11. The sum of the numbers of protons and neutrons in the nucleus of an atom.
  9. 12. One of the elements of Group 2 of the periodic table. (Be, Mg, Ca, Sr, Ba, Ra)
  10. 13. The substance that forms in a chemical reaction.
  11. 15. The process by which one or more substances change to produce one or more different substances.
  12. 16. A unit of mass that describes the mass of an atom or molecule.
  13. 21. The smallest unit of a substance that keeps all of the physical and chemical properties of that substance.
  14. 28. One of the elements of Group 17 of the periodic table, combines with most metals to form salts. (F, Cl, Br, I, At)