Atomic Theories and Models

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Across
  1. 1. He gave us the particle theory of matter and the "billiard model" of the atom
  2. 6. In this experiment, positive particles were beamed through gold foil and 1 out of every 20000 particles bounced back, which Rutherford concluded was a result of a dense nucleus at the centre of each atom.
  3. 8. A Greek philosopher that stated that all mater was made of tiny particles that he called "atomos"
  4. 9. Our modern periodic table is a modified version of his table.
  5. 10. He was the first African American to discover a new element, rutherfordium and dubnium!
  6. 13. This model of the atom proposed by JJ Thomson indicates that atoms were composed of negative subatomic particles embedded in a sphere of positively charged particles.
  7. 16. He organized the periodic table by increasing atomic mass.
  8. 17. He published his periodic table and left blank spaces for elements that he felt hadn't yet been discovered.
  9. 18. The original term given to electrons by JJ Thomson.
Down
  1. 2. He discovered electrons
  2. 3. He was a student of Rutherford and worked to enhance Rutherford's model of the atom
  3. 4. He devised the "gold foil experiment" that led to the discovery of the atom.
  4. 5. She was the first African American woman to discover an element, tennessine!
  5. 7. His work proved that properties of elements depended on atomic number instead of atomic mass.
  6. 11. He suggested that the number of positive charges in the nucleus was how the elements should be arranged on the periodic table.
  7. 12. He led the first Asian team to discover a new element, nihonium!
  8. 14. He discovered neutrons
  9. 15. He organized the periodic table in triads, or groups of 3 elements.