Parts of a atom crossword

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Across
  1. 2. Number - Equals the number of protons in an atom.
  2. 5. - Energy level in which electrons orbit around the nucleus.
  3. 8. - Substance composed of only one type of atom.
  4. 9. Mass - Sum of protons and neutrons in an atom.
  5. 10. -an ion that is negatively charged
  6. 13. - Term referring to particles smaller than an atom.
  7. 14. - Atom with a net electric charge due to gaining or losing electrons.
  8. 15. - Atoms of the same element with different numbers of neutrons.
Down
  1. 1. electron -The electrons in the outermost shell, or energy level, of an atom
  2. 3. - Electrically neutral subatomic particle.
  3. 4. - Positively charged subatomic particle.
  4. 6. - Negatively charged subatomic particle.
  5. 7. - One of the most basic forms of matter that make up the heavier elementary particles
  6. 11. - Central region of an atom, containing protons and neutrons.
  7. 12. -An ion that is positively charged