Atomic Theory Vocab

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