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In other words, during 704 million years, half the U-235 atoms that existed at the beginning of that time will decay to Pb-207. Many elements have some isotopes that are unstable, essentially because they have too many neutrons to be balanced by the number of protons in the nucleus.

Each of these unstable isotopes has its own characteristic half life.

radioactive dating shows that-25

A nucleus with that number of protons is called lead (chemical symbol Pb). This particular form (isotope) of lead is called Pb-207.

U-235 is the parent isotope of Pb-207, which is the daughter isotope.

Many rocks contain small amounts of unstable isotopes and the daughter isotopes into which they decay.

The teacher should tell the students that there are two basic principles used by geologists to determine the sequence of ages of rocks.

They are: Principle of superposition: Younger sedimentary rocks are deposited on top of older sedimentary rocks.

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