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Across 3. (two words) time taken for half the remaining atoms of an isotope to decay 4. ............ number. The number of protons & neutrons in an atom 5. particles/waves which are released during nuclear reactions 7. the most ionising type of radiation 8. metal used to stop gamma rays 10. the type of charge a proton has 11. part of the atom where alpha, beta, gamma come from

Down 1. these are found around the outside of the atom 2. the most penetrating type of radiation 5. radioactive decay is ........ in nature 6. term for atoms with the same proton number but different neutron number 9. where most of the mass of the atom can be found