Atoms: The Building Block Of Matter

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Across
  1. 7. a radioactive form of an element.
  2. 9. a substance that takes part in and undergoes change during a reaction.
  3. 12. 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.
  4. 13. a strong attractive force between nucleons in the atomic nucleus that holds the nucleus together.
  5. 17. plum pudding model
  6. 19. a distinct kind of atom or nucleus characterized by a specific number of protons and neutrons.
  7. 20. a coherent, typically large body of matter with no definite shape.
Down
  1. 1. 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.
  2. 2. a beam of electrons emitted from the cathode of a high-vacuum tube.
  3. 3. 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.
  4. 4. the total number of protons and neutrons in a nucleus.
  5. 5. 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.
  6. 6. 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.
  7. 8. "father of modern science".
  8. 10. a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.
  9. 11. occupies space and possesses rest mass, especially as distinct from energy.
  10. 14. the basic unit of a chemical element.
  11. 15. a substance that is formed as the result of a chemical reaction.
  12. 16. reaction/ 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.
  13. 18. 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.