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In the decades that followed, scientists made important new discoveries about the structure and behavior of atoms, and they refined their existing dating techniques.

Radioactive dating is one of the primary tools of science.

Isotopes are forms of an element that have the same number of electrons and protons but different numbers of neutrons.

Some of these atomic arrangements are stable, and some are not.

The unstable isotopes change over time into more stable isotopes, in a process called radioactive decay.

Creation science is one theoretical system and evolution is another.In nature, the constant decay of radioactive isotopes records the march of years.Scientists can use the clocklike behavior of these isotopes to determine the age of rocks, fossils, and even some long-lived organisms.Additionally, each element (atom) varies in the number of neutrons in the nucleus. Each isotope has a different atomic mass (or weight), conveniently measured by counting the total of the protons and neutrons in the nucleus. The last two isotopes are also known as deuterium and tritium, but they are still hydrogen, and can still combine with other atoms to make water, coal or tomatoes, for example.While isotopes have the same chemical behavior, they do not share the same nuclear behavior.Geologists determine the age of rocks, fossils, and sediments using a variety of methods including relative and absolute dating.In dating any object, geologists: When dating an object, a geologist measures some physical property of the object, which is believed to provide evidence regarding its age.Isotopes decay at an exponential rate that that can be described in terms of half-life.One half-life is the time it takes for ½ of the parent isotopes present in a rock or bone or shell to decay to daughter isotopes.But just how do researchers determine the ages of the materials they unearth?(Hint: It¿s not just carbon-dating anymore.) These days hardly a week goes by without important discoveries concerning the history of life on Earth making headlines.Indeed, just last month researchers described a fossil that pushes the origins of key mammal features back some 45 million years.And last week scientists announced that new dates for an extinction event that claimed most of Australia's large animals show that humans, not the climate, wiped them out.Protons try to repel each other, since they share the same positive electical charge.Age dating the Earth (Geochronology) is the scientific study of the age of the Earth and the temporal sequence of events related to the formation of the planet and the history of life on Earth.

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