The Periodic Table crossword puzzle/Created by: Elijah Gresham

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Across
  1. 4. Has a definite volume but no definite shape
  2. 5. basic building block of life
  3. 6. a thing that is composed of two or more separate elements; a mixture.
  4. 7. Has a Neutral charge
  5. 10. the mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.
  6. 11. Creator of the periodic table
  7. 12. a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
  8. 15. an element that has no metallic properties
  9. 16. number 26 on the periodic table
  10. 18. Has a positive charge
Down
  1. 1. The amount of protons in an atom of an element
  2. 2. The system of electrons surrounding the nucleus of an atom.
  3. 3. a pure substance consisting only of atoms that all have the same numbers of protons in their nuclei
  4. 8. Has a definite shape and volume
  5. 9. The mass per unit volume of a substance
  6. 11. Amount of energy in an object
  7. 13. Has an negative charge
  8. 14. Has no definite shape or definite volume
  9. 17. a Danish physicist who made foundational contributions to understanding atomic structure and quantum theory.