Periodic table

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Across
  1. 3. a _____ is a column of elements in the periodic table
  2. 5. the chemical element of the atomic number 8
  3. 6. the total number of protons and neutrons in a nucleus
  4. 8. a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivity
  5. 10. a colorless, odorless, highly flammable gas, the chemical element of atomic number 1
  6. 11. a thing that is composed of 2 or more separate elements
  7. 13. the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table
  8. 14. on the periodic table ________ are placed between metals and nonmetals
  9. 16. 1 or 2 letters that represent an element
  10. 17. there are 7 _____ going horizontally across the Periodic Table
  11. 18. chemical ______ cannot be broken down by chemical means
Down
  1. 1. an element or substance that is not a metal
  2. 2. _____ is a body of matter with no specific shape
  3. 4. a table of chemical elements arranged in order of atomic number
  4. 6. that which occupies space and possesses rest mass
  5. 7. elements are arranged in a ______ of rows (or periods)
  6. 9. the smallest particle that has the properties of an element
  7. 12. Is a chemical element with the symbol of Ar
  8. 14. a group of atoms bonded together
  9. 15. A person that studies science