Atomic Structure and the Periodic Table

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Across
  1. 2. weakest fundamental force
  2. 4. If there are more protons than electrons, you would have a positive __________.
  3. 5. large number of elements found to the left and center of the periodic table
  4. 7. This researcher discovered the positively-charged nucleus during his gold foil experiment.
  5. 10. This force holds together the nucleus.
  6. 12. Greek philosopher who came up with the idea of atoms
  7. 13. This is where we find neutrons and protons.
  8. 14. Horizontal rows on the periodic table
  9. 15. gases that are nonreactive and found to the far right of the periodic table
  10. 17. Electrons have a much smaller ______ than protons or neutrons.
  11. 18. This scientist discovered neutrons.
  12. 21. This researcher came up with the plum pudding atomic model.
Down
  1. 1. Atomic __________ is the total of protons and neutrons.
  2. 3. Researcher who created a model of the atom with electrons circling the nucleus in fixed orbitals like planets
  3. 6. In order for an atom to have no charge, it must have an equal number of protons and these negatively-charged subatomic particles.
  4. 8. The atomic number is the number of these positively charged particles in one atom of the element.
  5. 9. As you get further from the nucleus the energy level of electrons gets ______________.
  6. 11. different forms of the same element that differ in the number of neutrons
  7. 12. Researcher who proposed that atoms combine in given ratios to form compounds
  8. 16. The only form of nuclear decay/radiation that does not create a different element
  9. 19. Schrodinger helped develop our idea of an electron ___________.
  10. 20. Most of an atom's ______________ is made up of empty space.