Matter & Periodic Table

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Across
  1. 3. Subatomic particle with a negative (-)charge located outside the nucleus.
  2. 6. mixture which is not uniform throughout, the component substances can be visibly distinguished.
  3. 7. the basic building block of matter.
  4. 8. physical combinations of two or more different substances.
  5. 9. 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.
  6. 11. a column in the periodic table of the chemical elements
  7. 13. 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
  8. 14. Subatomic particle with a positive (+) charge located in the nucleus (center) of an atom.
  9. 15. the horizontal rows on the periodic table
Down
  1. 1. electrons in the outermost shell of an atom, and that can participate in the formation of a chemical bond
  2. 2. Pure substance that is made up of two or more types of atoms/elements that are chemically bonded together
  3. 4. Pure substances, made of one type of atom, that cannot be changed into simpler substances.
  4. 5. abbreviations used in chemistry, mainly for chemical elements
  5. 6. mixture which is uniform throughout, the substances are evenly mixed and cannot be visibly distinguished.
  6. 10. Subatomic particle with no charge (neutral charge) located in the nucleus of an atom.
  7. 12. anything that has mass and takes up space.