Solve these clues to fill the grid.
- A particle that is electrically charged
- 2 Across
- A solid formed by the solidification of a chemical and having a highly regular atomic structure
- 3 Across
- A character or symbol set or printed or written beneath or slightly below and to the side
- 5 Across
- The simplest structural unit of an element or compound
- 7 Across
- A chemical ___ that involves sharing a pair of electrons between atoms in a molecule
- 8 Across
- Any compound containing a ___ atom
- 9 Across
- A salt or ester of ___ acid
- 1 Down
- A chemical ___ in which one atom loses an electron to form a positive ion and the other atom gains
- 2 Down
- A salt or ester of sulphuric acid
- 4 Down
- A light soft silver-white metallic element of the alkali metal group
- 6 Down