chemistry

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Across
  1. 5. a negatively charged subatomic particle.
  2. 7. a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
  3. 8. occupies space and possesses rest mass, especially as distinct from energy.
  4. 10. Cloud the system of electrons surrounding the nucleus of an atom.
Down
  1. 1. any substance that cannot be decomposed into simpler substances by ordinary chemical processes.
  2. 2. 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. same as proton
  4. 4. Electron a single electron or one of two or more electrons in the outer shell of an atom that is responsible for the chemical properties of the atom.
  5. 6. the positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass
  6. 9. the basic unit of a chemical element.