Parts of an Atom

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Across
  1. 3. The vertical columns on the periodic table.
  2. 4. Electrons in the outermost shell of an atom.
  3. 9. The horizontal rows on the periodic table.
  4. 10. The central part of an atom, contains protons and neutrons.
  5. 11. The smallest unit of an element, consisting of protons, neutrons, and electrons.
  6. 12. A negatively charged ion.
  7. 13. A positively charged particle found in the nucleus.
  8. 15. A charged atom, is formed when an atom gains or loses electrons.
  9. 16. A substance that is made of only one type of atom.
Down
  1. 1. Atoms of the same element that have a different number of neutrons.
  2. 2. A negatively charged particle that orbits around the nucleus.
  3. 5. The number of protons in an atom's nucleus.
  4. 6. A positively charged ion.
  5. 7. A neutrally charged particle found in the nucleus.
  6. 8. The sum of the number of protons and neutrons in an atom’s nucleus.
  7. 14. The electrical property of particles, either positive or negative.