Solve these clues to fill the grid.
- An elementary particle with 0 charge and mass about equal to a proton
- 2 Across
- Any of various water-soluble compounds capable of turning litmus blue and reacting with an acid
- 4 Across
- Happening or recurring at regular intervals
- 5 Across
- Any of five related nonmetallic elements that are all monovalent and readily form negative ions (plural)
- 8 Across
- To cause to repeat a cycle
- 9 Across
- The act of passing from one state or place to the next
- 11 Across
- An area in which something acts or operates or has power or control: "the range of a supersonic jet"
- 14 Across
- A dead body that has been brought back to life by a supernatural force
- 15 Across
- Nocturnal burrowing mammal of the grasslands of Africa that feeds on termites
- 16 Across
- A star that explodes and becomes extremely luminous in the process
- 1 Down
- An elementary particle with negative charge
- 3 Down
- Center of an atom or a cell
- 6 Down
- One of three divisions into which play is divided in hockey games (plural)
- 7 Down
- Any of numerous extinct terrestrial reptiles of the Mesozoic era
- 10 Down
- An arrangement of objects or people side by side in a line (plural)
- 12 Down
- The smallest component of an element having the chemical properties of the element
- 13 Down