Across
- 3. a groupd of atoms bonded together
- 4. different number of neutrons, but chemically react the same
- 7. happens when electrostatic attraction in proton and electromagnetic attraction in atom
- 9. two ions transfer one or more electrons
- 11. composed of two or more elements
- 12. negative charge orbits the nucleus
Down
- 1. particles sticking together of different substances
- 2. particle sticking together of the same substance
- 5. atoms stuck together; sharing electron(s)
- 6. substance that cannot be broken down
- 8. center of an atom
- 10. atom that has a charge