Across
- 6. A subatomic particle that has a positive charge. It is found in the nucleus of an atom.
- 8. This is the total number of protons and neutrons together
- 10. A radiation that has the highest energy and is the most dangerous. It is a form of electromagnetic radiation.
- 12. When an element with the same protons has a different number of neutrons.
- 13. A particle that is an electron and is thrown out of the nucleus.
- 14. This particle has 2 protons and 2 neutrons. It contains helium gas and is the least dangerous particle.
Down
- 1. the time it takes for half of the original worth of a radioactive element to decay.
- 2. when two atomic nuclei combine to make another atomic nucleus with much more energy and weight.
- 3. A subatomic particle that has no charge. It is also found in the nucleus.
- 4. It decides the chemical properties of an element and is the number of protons in a nucleus.
- 5. atoms are split apart and release energy. This is a chain reaction.
- 7. the ability of an atom to release a mass or energy.
- 9. when one event leads to a series of events that go on forever.
- 11. This has positive charged protons and neutral neutrons in it. Around it is an electron cloud.