Science

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Across
  1. 4. bonded / type of chemical bond in which two electron pairs are shared between two atoms
  2. 5. table / a table of the chemical elements arranged in order of atomic number
  3. 7. / a pure substance which cannot be broken down by chemical means
  4. 8. / the product of the random distribution of one substance through another without any chemical reaction,
  5. 9. / a subatomic particle of about the same mass as a proton but without an electric charge
  6. 10. / the basic unit of a chemical element.
Down
  1. 1. bond / a connection between two surfaces or objects that have been joined together by a chemical reaction
  2. 2. / a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.
  3. 3. / a group of atoms bonded together
  4. 6. / a substance formed from two or more elements chemically united in fixed proportions.
  5. 7. / type of chemical bond in which two electron pairs are shared between two atoms