Isotopes are atoms of the same element that have
different masses. They have the same number of
protons but a different number of neutrons. The
isotope number is the number of protons plus the
number of neurons.
The Half-life is the length
of time required for half of a given number of
initial number of atoms of that isotope to decay.
Each individual radioactive substance has a
characteristic and different half-life.
Example of three different isotopes of uranium and
its half-life period is given
uranium-234: half life = 244 thousand
uranium-235: half life = 704 million
uranium-238: half life = 4.5 billion
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