The isotopes of promethium, 144/59 Pr and 134/59 Pr, are unstable, and lie on op

Question

The isotopes of promethium, 144/59 Pr and 134/59 Pr, 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, decay; promethium-134, positron decay

b. promethium-144, positron decay; promethium-134, decay

c. promethium-144, positron decay; promethium-134, electron capture

d. promethium-144, electron capture; promethium-134, positron decay

e. promethium-144, decay; promethium-134, y decay

Explanation / Answer

answer : a. promethium-144, decay; promethium-134, positron decay

explanation :

61 Pm 144 .   this nuclide N / P ratio = 83 / 61 = 1.36

61 Pm 134 ,this nuclide N / P ratio = 73 / 61 = 1.20

N / P ratio very high nuclide loose beta partical or electtron . and N/ P just above to this zone can loose positron

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