Atomic Theory Vocab

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Across
  1. 2. Anything that has mass takes up space.
  2. 6. Outer rings of atoms that contain electrons. These shells orbit around the nucleus.
  3. 8. The area around the nucleus of an atom where electrons are most likely to be found.
  4. 9. The smallest piece of an element that still holds the properties of the element.
  5. 10. Atomic mass unit used to measure the mass of atoms.
  6. 12. Smaller particles that protons and neutrons are made of.
  7. 13. Subatomic particles that carry a neutral charge.
  8. 14. The number of protons that an element contains.
Down
  1. 1. Subatomic particles that carry a negative charge.
  2. 3. The center core of the atom containing protons and neutrons.
  3. 4. The sum of the number of protons and the number of neutrons in the nucleus of an atom.
  4. 5. Subatomic particles that carry a positive charge.
  5. 7. The weighted average mass of all naturally occurring isotopes of the element.
  6. 11. Atoms with the same number of protons and a different number of neutrons.