Solve these clues to fill the grid.
- An impetuous rush toward someone or something
- 2 Across
- Any of the chemically inert ___ elements of the helium group in the periodic table
- 5 Across
- The smallest component of an element having the chemical properties of the element
- 6 Across
- The simplest structural unit of an element or compound
- 9 Across
- A particle that is electrically charged
- 10 Across
- Center of an atom or a cell
- 12 Across
- An area in which something acts or operates or has power or control: "the range of a supersonic jet"
- 14 Across
- An abstract part of something
- 15 Across
- Any of several chemical elements that are usually shiny solids that conduct heat or electricity
- 16 Across
- That which has mass and occupies space
- 1 Down
- An electrical force linking atoms
- 3 Down
- A tiny piece of anything
- 4 Down
- A stable particle with positive charge equal to the negative charge of an electron
- 7 Down
- An elementary particle with negative charge
- 8 Down
- An elementary particle with 0 charge and mass about equal to a proton
- 11 Down
- Ammunition consisting of a cylindrical metal casing containing an explosive charge and a projectile (plural)
- 13 Down