Across
- 3. radioactive material left over from the operation of nuclear reactors
- 4. time takes for half of a given quantity of substance to decay
- 6. basic unit of chemical element/building block
- 8. by which an unstable atomic nucleus trans into more stable
- 11. extremely dense and tiny,central core of atom contain almost all of its mass
- 12. where 2 light atomic nuclei combine to form single
- 13. large atomic nucleus splits into 2 or more
Down
- 1. energy as electromagnetic waves or as moving subatomic particles
- 2. energy released from an atoms nucleus which is central core
- 5. with unstable atomic nuclei that decay to become stable
- 7. sequence of reactions where a reactive product or by-product causes additional reactions
- 9. two or more forms of of same element that contains equal number of protons but different number of nuetrons
- 10. central membrane bound organelle