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    Predicting radioactive decay

    say i give you a certain radioactive isotope and i want to predict whether it emits alpha or beta decay, emits a positron or accepts? eg. Fe-53 or Th-144 I know that there is a trend; that heavier elements tend to emit beta particles however, that isn't always the case. can anyone help?
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    About the colour change of indicators

    i like universal indicator-it stains your shirt. tastes short of like...old cabbage
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