challenge

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Across
  1. 1. Important for energy transfer in cells (ATP). Found in bones and teeth. Used in fertilizers. Glows in the dark in some forms.
  2. 5. A fundamental substance made up of only one type of atom.
  3. 6. Essential for transporting oxygen in blood. Found in red meat and spinach. Used to make steel. Magnetic metal.
  4. 7. Occupies space and has mass.
  5. 9. Can be physical or chemical.
Down
  1. 1. Molecule or atom.
  2. 2. _____ of matter.
  3. 3. Trace element that acts as an antioxidant. Helps protect cells from damage. Found in nuts, especially Brazil nuts. Important for thyroid health.
  4. 4. The basic building block of matter and the smallest unit of a chemical element that retains its chemical properties.
  5. 8. The capacity to do work or cause change.