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atoms or nuclei that have the same number of protons but different number of neutrons

intensely ionising

high penetrating power

have no charge or mass

mostly comes from natural sources

what occurs in unstable nuclei

what is ejected during alpha decay

in which process does a neutron turn into a proton

what is given off by very energetic or excited nuclei

time taken for the mass / number / percentage / activity of the nuclei to halve