Atoms: The Building Block Of Matter

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  1. 4. a radioactive form of an element.
  2. 8. occupies space and possesses rest mass, especially as distinct from energy.
  3. 9. law of constant composition states that a given chemical compound always contains its component elements in fixed ratio (by mass) and does not depend on its source and method of preparation.
  4. 12. the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
  5. 14. process that involves rearrangement of the molecular or ionic structure of a substance, as opposed to a change in physical form or a nuclear reaction.
  6. 15. 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.
  7. 16. a strong attractive force between nucleons in the atomic nucleus that holds the nucleus together.
  8. 18. a coherent, typically large body of matter with no definite shape.
  9. 19. the theory that matter consists of indivisible particles called atoms and that atoms of a given element are all identical and can neither be created nor destroyed.
  10. 20. a substance that is formed as the result of a chemical reaction.
Down
  1. 1. a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.
  2. 2. the total number of protons and neutrons in a nucleus.
  3. 3. a beam of electrons emitted from the cathode of a high-vacuum tube.
  4. 5. 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.
  5. 6. the basic unit of a chemical element.
  6. 7. when two elements combine in more than one proportion to form two or more compounds the weights of one element that combine with a given weight of the other element are in the ratios of small whole numbers.
  7. 10. a substance that takes part in and undergoes change during a reaction.
  8. 11. a distinct kind of atom or nucleus characterized by a specific number of protons and neutrons.
  9. 13. "father of modern science".
  10. 17. plum pudding model