Across
- 2. is at the center of an atom.
- 5. can have a positive or negative charge.
- 6. to make sure information is correct or valid.
- 7. a branch of math dealing with properties of continuous surfaces.
Down
- 1. is an example of a noble gas.
- 3. a process that reveals the effect of something.
- 4. a branch of mathematics that focuses on the analysis of data.