science

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Across
  1. 5. Number of Protons and Electrons
  2. 7. elements that are good conductors of heat and electricity
  3. 8. Matter that can combine chemically
  4. 9. The mass of an atom
  5. 12. those which lack all the metallic attributes.
  6. 14. the degree of combining power of an element as shown by the number of atomic weights of a monovalent element
  7. 15. A chemical particle with a neutral charge
  8. 16. A chemical particle with a positive charge
Down
  1. 1. Forms of matter (Solid,Liquid and Gas.)
  2. 2. Chemically inactive
  3. 3. an expression that shows the elements in a compound and the relative proportions of those elements
  4. 4. Arrangement of elements
  5. 6. a class of chemical elements with similar properties
  6. 10. Abbreviation of a chemical element
  7. 11. A chemical particle with a negative charge
  8. 13. the positively charged central core of an atom