Atomic Structure

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Across
  1. 3. An arrangement of elements in which the elements are separated into groups based on a set of repeating properties.
  2. 6. An element is a weighted average mass of the atoms in a naturally occurring sample of the element.
  3. 7. Positively charged subatomic particles.
  4. 9. The vertical columns on the periodic table.
  5. 10. Atoms that have the same number of protons but different numbers of neutrons.
Down
  1. 1. Negatively charged subatomic particles.
  2. 2. Subatomic particles with no charge but with a mass nearly equal to that of a proton.
  3. 4. The number of protons in the nucleus of an atom of that element.
  4. 5. the smallest particle of an element that retains its identity in a chemical reaction.
  5. 8. The horizontal rows on the periodic table.