Chemistry

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Across
  1. 2. set of at least two atoms, identical or not, chemically attached to each other
  2. 5. A chemical element with atomic number 55, symbol Cs, the most alkaline of the alkali metals
  3. 6. A particle that makes up the nucleus of an atom and has a positive charge identical to that of the
  4. 8. A fragment of a chemical component constituting the tiniest quantity able to be associated with another element
  5. 9. a negatively charged particle that comprises the external part of the atom
Down
  1. 1. A chemical element with the symbol Be and atomic number 4. The best known gemstones from it are the emerald and the aquamarine
  2. 3. an elementary particle, constitutive of the atomic nucleus. One exception is the normal hydrogen nucleus
  3. 4. An ion is an atom or molecule that has gained or lost one or more electrons.
  4. 7. The internal part of an atom. It is composed of neutrons and protons