The isotopes of promethium, $The isotopes of promethium, and , are unstable, and lie on opposite sides of the line of stability. Which of the following combinations is most likely to represent the type of decay for these isotopes? A) promethium-144, \beta decay; promethium-134, positron decay B) promethium-144, positron decay; promethium-134, \beta decay C) promethium-144, positron decay; promethium-134, electron capture D) promethium-144, electron capture; promethium-134, positron decay E) promethium-144, \beta decay; promethium-134, \gamma decay$ and $The isotopes of promethium, and , are unstable, and lie on opposite sides of the line of stability. Which of the following combinations is most likely to represent the type of decay for these isotopes? A) promethium-144, \beta decay; promethium-134, positron decay B) promethium-144, positron decay; promethium-134, \beta decay C) promethium-144, positron decay; promethium-134, electron capture D) promethium-144, electron capture; promethium-134, positron decay E) promethium-144, \beta decay; promethium-134, \gamma decay$ , are unstable, and lie on opposite sides of the "line of stability." Which of the following combinations is most likely to represent the type of decay for these isotopes?
A) promethium-144,

\beta

decay; promethium-134, positron decay
B) promethium-144, positron decay; promethium-134,

\beta

decay
C) promethium-144, positron decay; promethium-134, electron capture
D) promethium-144, electron capture; promethium-134, positron decay
E) promethium-144,

\beta

decay; promethium-134,

\gamma

decay

The Isotope Has a Half-Life of 7

Multiple Choice

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