Atoms Crossword Puzzle

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Across
  1. 1. An atom with more or less electrons.
  2. 6. A positively charged molecule.
  3. 7. A pure substance that consists entirely of one type of atom.
  4. 10. The number of protons in the nucleus if an atom.
  5. 11. The outermost shell of electrons in an atom.
  6. 13. The core of an atom containing protons and neutrons.
  7. 15. A bond formed when electrons are transferred from one atom to another.
  8. 16. Smallest part of matter that still retains the properties of an element.
  9. 17. Atoms of the same element with a different number of neutrons.
Down
  1. 2. A molecule with no charge.
  2. 3. The total number of protons and neutrons in a nucleus.
  3. 4. The vertical columns of the periodic table.
  4. 5. Electrons are shared during bonding.
  5. 6. The horizontal rows of the periodic table.
  6. 8. A substance formed by the chemical combination of two or more elements.
  7. 9. The structure formed by covalent bonds.
  8. 12. A negatively charged molecule.
  9. 14. Used to represent chemical elements.