Across
- 2. positive chreged particles inside the nucleus
- 5. substance formed by the chemical combination of two or more elements in definite proportions
- 6. negatively charged particle; constantly moving around the nucleus
- 8. one of several forms of a single element, which contains the same number of protons but different numbers of neutrons
Down
- 1. thebasicunit of matter
- 3. the center of an atom
- 4. neutralcharged particles inside the nucleus
- 7. pure substance that consists entirely of one type of atom