PS.4 Vocabulary

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Across
  1. 2. he man-made or laboratory made elements on the periodic table.
  2. 6. The positively charged subatomic particles in the nucleus of an atom.
  3. 9. A change of materials into another, new materials with different properties and one or more than one new substances are formed.
  4. 11. Organizes all discovered elements into rows (periods) and columns (groups) according to increasing atomic number.
  5. 12. A process that involves rearrangement of the molecular or ionic structure of a substance.
  6. 13. amount of protons in an element
  7. 14. Metals have a shiny appearance, are good conductors of heat and electricity, can be melted, are malleable and ductile.
  8. 17. Electron in the outer shell of an atom.
  9. 18. The horizontal rows on the periodic table. There are 7.
  10. 19. smallest unit of matter
  11. 20. The material involved in the change is structurally the same before and after the change.
Down
  1. 1. An element whose properties are between those of metals and solid nonmetals or semiconductors.
  2. 3. The center of an atom that includes protons and neutrons.
  3. 4. Forms of the same element that contain equal numbers of protons but different numbers of neutrons in the nucleus.
  4. 5. made up of one atom
  5. 7. An atom or molecule with a net charge due to the loss or gain of one or more electrons.
  6. 8. An expression that shows the elements in a compound and the proportions of those elements.
  7. 10. The averaged number of protons and neutrons in an element.
  8. 15. The neutrally (no charge) subatomic particle in the nucleus of an atom.
  9. 16. A type of chemical element that lacks the characteristics of a metal.
  10. 21. The vertical columns on the periodic table. There are 18.