Science Unit 1

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Across
  1. 2. A substance having a finite activation energy (band gap) for electron conduction.
  2. 8. A class of substances characterized by high electrical and thermal conductivity as well as by malleability, ductility, and high reflectivity of light.
  3. 10. Mass of a unit volume of a material substance.
  4. 11. Any atom or group of atoms that bears one or more positive or negative electrical charges.
  5. 12. A nearly in-compressible fluid that conforms to the shape of its container but retains a (nearly) constant volume independent of pressure.
  6. 14. Any substance composed of identical molecules consisting of atoms of two or more chemical elements.
  7. 17. Atoms mixed together but not chemically combined.
  8. 19. A group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
  9. 20. A column in the periodic table of the chemical elements.
  10. 21. One of four main states of matter, in which the molecules vibrate about fixed positions and cannot migrate to other positions in the substance.
  11. 22. A membrane-bound organelle that contains the cell's chromosomes.
  12. 23. Makes up everything.
  13. 25. the quantity of matter contained in an atom of an element.
Down
  1. 1. A particle of matter that uniquely defines a chemical element.
  2. 3. the number of a chemical element in the periodic system.
  3. 4. Stable subatomic particle that has a positive charge.
  4. 5. The state or power of being reactive or the degree to which a thing is reactive.
  5. 6. A very small particle that has a negative charge of electricity.
  6. 7. A state of matter that has no fixed shape and no fixed volume.
  7. 9. Any of the seven horizontal rows that contain elements arranged in order of increasing atomic number.
  8. 13. Any of a group of rare gases.
  9. 15. Neutral subatomic particle that is a constituent of every atomic nucleus except ordinary hydrogen.
  10. 16. Materials which have a conductivity between conductors.
  11. 18. Any of the six chemical elements that make up Group 1 (Ia) of the periodic table.
  12. 24. Any substance that cannot be decomposed into simpler substances.