Atomic Theory Vocab

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