Naming compound concepts

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Across
  1. 2. type of compound formed by metals and nonmetals (7 letters).
  2. 4. two nonmetals share electrons, it is this type of bond (8 letters).
  3. 5. When two atoms share one or more pairs of electrons, it is called this type of bond (8 letters).
Down
  1. 1. compounds have hydrogen and release H⁺ ions in water (4 letters).
  2. 3. A negatively charged ion formed when a nonmetal gains electrons (3 letters).
  3. 4. The ending used for the second element in a covalent compound name (4 letters).
  4. 5. The element that often appears with a negative charge when bonded with a metal (7 letters).