Across
- 2. where an electron is likely to be found in an atom
- 5. the central part of the atom
- 6. a small portion of matter
- 8. a pure substance made of only one type of atom that cannot be broken down into other substances
- 9. the smallest object that retains the properties of an element
- 10. particle found in a nucleus with a positive charge
Down
- 1. a particle made up of two or more atoms that are chemically bonded together
- 3. fundamental unit of negative charge
- 4. smaller than or occurring within an atom
- 7. almost identical in mass to a proton, but carries no electric charge