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What do the unstable isotopes have in common?

Select one:
a. more protons than neutrons
b. an odd number of protons
c. more neutrons than protons
d. an odd number of neutrons
e. an odd number of electrons

Which of these is an example of pseudoscience? a) predicting the time of sunrise based on data on position of earth b) predicting the date of the moon phases based on data on position of earth c) predicting eclipses based on the position of the sun and the moon d) predicting future events in a person's life based on the position of the moon