Chapter 4 Vocab

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Across
  1. 4. mass the total mass of matter in a single atom
  2. 9. ray A stream of electrons emitted from the cathode in a vacuum tube
  3. 12. A particle in the nucleus of an atom with no electric charge
  4. 13. Atoms of the same element that have different numbers of neutron
  5. 14. number he total number of protons and neutrons in an atom’s nucleus
  6. 15. A tiny negatively charged particle found in atoms
Down
  1. 1. number The number of protons found in the nucleus of an atom
  2. 2. atomic theory A theory that states all matter is made of tiny particles called atoms, which are indivisible and combine in fixed ratios to form compounds
  3. 3. The small, dense center of an atom that contains protons and neutrons
  4. 5. A positively charged particle found in the nucleus of an atom
  5. 6. table A chart that organizes all known elements by their atomic number and properties
  6. 7. the basic building block of all matter
  7. 8. A horizontal row in the periodic table; elements in a period have increasing atomic numbers
  8. 10. mass unit a unit of mass used for atoms and molecules
  9. 11. A vertical column in the periodic table; elements in a group have similar chemical properties