Grade 7 Science : Matter and Energy

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Across
  1. 3. The path electrons follow around the nucleus of an atom.
  2. 4. Negatively charged particles that orbit the nucleus of an atom.
  3. 7. A state of matter with widely spaced particles moving freely and quickly.
  4. 9. The process where a gas cools and changes into a liquid.
  5. 14. The process where a solid absorbs heat and changes into a liquid.
  6. 15. The process where a liquid changes into a gas, often by heating.
  7. 16. Positively charged particles found in the nucleus of an atom.
  8. 17. The basic units of matter, consisting of a nucleus surrounded by electrons.
  9. 20. The process where a liquid loses heat and changes into a solid.
  10. 21. A state of matter where particles are close together but can flow past one another.
  11. 22. A group of reactive nonmetals in Group 17 of the periodic table.
  12. 23. The process where a solid changes directly into a gas without becoming a liquid.
  13. 25. Elements that are poor conductors of heat and electricity, often brittle when solid.
Down
  1. 1. Anything that has mass and takes up space.
  2. 2. Gases Elements in Group 18 of the periodic table, known for their lack of reactivity.
  3. 5. Metals A group of metals located in the center of the periodic table, known for their conductivity and malleability.
  4. 6. The capacity to do work or cause change, present in many forms like kinetic and thermal.
  5. 8. Metals Highly reactive metals found in Group 1 of the periodic table.
  6. 10. The process where a gas changes directly into a solid without becoming a liquid.
  7. 11. Neutral particles found in the nucleus of an atom.
  8. 12. Zero The theoretical temperature at which all particle motion stops, 0 Kelvin.
  9. 13. A form of energy transfer between substances due to a temperature difference.
  10. 16. The small units of matter, including atoms, molecules, and ions.
  11. 18. A state of matter with particles tightly packed in a fixed structure.
  12. 19. Elements with properties of both metals and nonmetals, often found along the "stair-step" line on the periodic table.
  13. 24. Elements that are good conductors of heat and electricity, often malleable and ductile.