U235 earth dating
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The mass number doesnt change, while the atomic number goes down by 1.
So an atom of potassium-40 (K40), atomic number 19 can absorb an electron to become an atom of argon-40 (Ar40), atomic number 18.
In alpha decay, the radioactive atom emits an alpha particle.
u235 earth dating
There are two common kinds of radioactive decay, alpha decay and beta decay.
Thus, an atom of carbon-14 (C14), atomic number 6, emits a beta particle and becomes an atom of nitrogen-14 (N14), atomic number 7.
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