Vocabulary Chapter 4

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Across
  1. 4. A negatively charged subatomic particle that orbits the nucleus.
  2. 9. Mass, The weighted average mass of an element's isotopes
  3. 10. Atomic Theory, The first scientific theory that explained chemical changed in terms of atoms.
  4. 12. Table, A chart that arranges elements by their atomic number, grouping elements with similar properties.
  5. 14. A positively charged subatomic particle found in the atoms nucleus.
Down
  1. 1. The smallest unit of an element that remains its chemical properties.
  2. 2. A horizontal row on the periodic table.
  3. 3. Number, The number of protons in an atom's nucleus, which defines the element.
  4. 5. The dense Central core of an atom containing protons and neutrons.
  5. 6. Atoms of the same element with the same number of protons but different numbers of neutrons.
  6. 7. Number, The total number of protons and neutrons in an atoms nucleus.
  7. 8. Mass Unit, A unit of mass equal to 1/12th of mass of carbon-12 atom.
  8. 11. A neutral subatomic particle found in the atom's nucleus.
  9. 13. A vertical column on the periodic table.