Matter, Atoms, and the Periodic Table for 8th Grade

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Across
  1. 3. An element that has properties of both metals and nonmetals.
  2. 6. Anything that has mass and takes up space.
  3. 11. A subatomic particle with no charge (neutral) located in the nucleus.
  4. 13. The smallest unit of a compound that retains the properties of that compound; formed by covalent bonds.
  5. 16. A characteristic of a substance that describes its ability to change into a new substance (e.g., flammability, reactivity).
  6. 19. A characteristic of a substance that can be observed or measured without changing its identity (e.g., color, density, melting point).
  7. 20. A table that organizes elements by atomic number, electron configuration, and recurring properties.
Down
  1. 1. Elements that are poor conductors of heat and electricity; many are gases at room temperature.
  2. 2. A change in a substance that does not change its identity, such as a change in state.
  3. 4. The number of protons in the nucleus of an atom.
  4. 5. A positively charged subatomic particle located in the nucleus of an atom.
  5. 7. The dense, positively charged center of an atom.
  6. 8. A process by which a substance becomes a new and different substance.
  7. 9. The smallest component of an element having the chemical properties of that element.
  8. 10. The amount of mass per unit volume of a substance Density=Mass/Volume
  9. 12. A negatively charged subatomic particle that orbits the nucleus.
  10. 14. A pure substance that cannot be broken down into simpler substances by chemical means.
  11. 15. Elements that are typically solid, shiny, malleable, and good conductors of heat and electricity.
  12. 17. Mass The weighted average mass of an atom's protons and neutrons.
  13. 18. A substance made up of two or more different elements chemically combined.