Across
- 2. the emission of ionizing radiation
- 3. the overall weight of the nucleus in an atom
- 7. weightless packets of energy called photons
- 10. The time it takes for half of something to decay
- 11. the positively charged central core of an atom
- 13. atoms with the same number of protons and electrons, but a different number of neutrons
Down
- 1. One thing happens which causes multiple other things to happen
- 4. the number that represents protons and nuetrons on the periodic table
- 5. two protons and two neutrons tightly bound together
- 6. Beta particles have a mass which is half of one thousandth of the mass of a proton and carry either a single negative (electron) or positive (positron) charge
- 8. a heavy nucleus splits spontaneously
- 9. a proton but without an electric charge
- 12. a particle in the nucleus with a positive charge