Week 4 Discussion

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Across
  1. 3. The smallest unit of an element that still has its properties
  2. 7. Elements with properties between metals and nonmetals
  3. 8. The change of state from a solid to a liquid when heat is added
  4. 10. The average mass of an element’s atoms based on isotopes
  5. 11. A substance formed when two or more elements are chemically bonded
  6. 13. A positively charged particle found in the nucleus of an atom
  7. 14. Scientist known for discovering the nuclear model of the atom
  8. 16. Atoms of the same element with different numbers of neutrons
  9. 18. Scientist who discovered the electron and proposed the plum pudding model
  10. 19. A pure substance made of only one type of atom
  11. 20. A comparison of an atom’s mass to a standard reference (carbon-12)
  12. 21. Elements that are generally poor conductors and not shiny or malleable
Down
  1. 1. A homogeneous mixture where one substance is dissolved evenly in another
  2. 2. A mixture where particles are spread through a liquid but will settle over time
  3. 4. A physical combination of two or more substances that are not chemically bonded
  4. 5. life The time it takes for half of a radioactive substance to decay
  5. 6. A horizontal row on the periodic table
  6. 9. A vertical column on the periodic table
  7. 11. A property of particles that can be positive or negative
  8. 12. Highly reactive metals found in Group 1 of the periodic table
  9. 14. A chemical reaction where iron reacts with oxygen and water to form rust
  10. 15. The emission of energy or particles from an unstable nucleus
  11. 17. Neutral particles found in the nucleus of an atom