Unit 1 Atomic Theory

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Across
  1. 5. Negatively charged particles found in the space outside of the nucleus of the atom
  2. 10. Outermost electron shell
  3. 11. Basic unit of matter
  4. 13. Positively charged particle in the nucleus of the atom.
  5. 14. The average mass of all the isotopes of an element
  6. 16. Number of protons and neutrons in the nucleus of an atom
  7. 17. Electron has absorbed energy and "jumped" to a higher energy level, farther from the nucleus
  8. 19. The number of protons in the nucleus of an atom
  9. 20. volumes of space surrounding the atomic nucleus where electrons are likely to be found
Down
  1. 1. Atomic model with a dense positive nucleus, mostly space, and electrons around the outside.
  2. 2. Conducted "Gold Foil Experiment" and discovered that atoms are mostly empty space with a very dense nucleus.
  3. 3. configuration The lowest energy electron configuration for an atom or molecule
  4. 4. One of two or more atoms of the same element with different numbers of neutrons.
  5. 6. In an experiment in which Rutherford shot particles at gold foil, and found that most particles went straight through.
  6. 7. modern model of the atom, shows the most probable location for an electron-called the orbital, and electrons have wave-like properties.
  7. 8. Neutrally charged particle in the nucleus of the atom
  8. 9. A model that uses electron-dot structures to show how electrons are arranged in molecules. Pairs of dots or lines represent bonding pairs.
  9. 12. Theorized that electrons travel around the nucleus like planets around the Sun
  10. 15. Atomic model with electrons orbiting the nucleus in a set path like planets around the Sun.
  11. 18. The central region of an atom; made up of protons and neutrons.