In beta decay the atomic number and mass number increase by 1.
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Q47: Isotopes always have the same atomic number.
Q48: Isotopes always have the same mass number.
Q49: All elements with atomic number 83 or
Q50: All isotopes of elements with atomic 82
Q51: A positron is a positively charged electron.
Q53: In alpha decay both the mass number
Q54: In positron decay the atomic number decreases
Q55: After four half-lives the activity of a
Q56: After three half-lives 25 radioactive nuclei remain
Q57: After three half-lives 12.5% of the radioactive
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