Solve these clues to fill the grid.
- A stable particle with positive charge equal to the negative charge of an electron
- 2 Across
- A large sandwich made of a long crusty roll split lengthwise and filled with meats and cheese
- 5 Across
- A material's opposition to the flow of electric current
- 7 Across
- Bottom part something stands on; a safe spot in baseball
- 10 Across
- A unit of electrical energy equal to the work done when a current of one ampere passes through (plural)
- 11 Across
- A fourth state of matter distinct from solid or liquid or gas and present in stars and fusion
- 12 Across
- A substance consisting of two or more substances mixed together
- 13 Across
- An elementary particle with 0 charge and mass about equal to a proton
- 15 Across
- A push or a pull
- 16 Across
- Hopeful and optimistic; the opposite of negative
- 1 Down
- Any of various water-soluble compounds having a sour taste and capable of turning litmus red
- 3 Down
- A piece of photographic film showing an image with light and shade or colors reversed
- 4 Down
- An abstract part of something
- 6 Down
- The smallest component of an element having the chemical properties of the element
- 8 Down
- An elementary particle with negative charge
- 9 Down
- A simple machine consisting of a wheel with a groove in which a rope can run to change
- 14 Down
