The Evolution of Atomic Theory

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Across
  1. 4. / A physical, conceptual, or mathematical representation of a phenomena that is hard to observe directly.
  2. 6. / Discovered the positively charged nucleus with negatively charged particles scattered around it aka Cherry with a Pit Model.
  3. 9. / A repeating circular path.
  4. 10. / Today's modern theory of the atom that says an electron's locating around the nucleus is dependent on how much energy it has aka Cotton Ball Model.
  5. 13. / Discovered that atoms were made of smaller positively and negatively charged particles aka The Chocolate Chip Cookie Model.
  6. 14. / Negatively charged particle found outside the nucleus of an atom.
  7. 15. / The measure of the amount of matter an object is made of.
Down
  1. 1. / Anything that has a measurable mass and volume
  2. 2. / Theorized that electrons move in orbits around the nucleus like planets orbit the sun aka Solar System Model
  3. 3. / First scientist to question what the smallest particle of matter was. He named this particle "atomos" and described them as being made of the same material in different shapes and sizes.
  4. 5. / Declared all matter was made of 4 elements: Earth, Air, Fire, and Water. His ideas were accepted for centuries!
  5. 7. / Center of an atom that is made of protons and neutrons.
  6. 8. / The smallest unit of an element that retains the properties of that element.
  7. 11. / Theorized that all matter was made of atoms that were too small to see and could not be broken down aka Billiard Ball Model.
  8. 12. / The ability to do work.