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Each chemical element, such as carbon and oxygen, consists of atoms unique to it.

Each atom is understood to be made up of three basic parts.

These parent radioisotopes change into daughter lead-206, lead-207, argon-40, strontium-87, and neodymium-143 isotopes, respectively.

Thus, geologists refer to uranium-lead (two versions), potassium-argon, rubidium-strontium, or samarium-neodymium dates for rocks.

Examples are granites (formed by cooling under the ground) and basalts (formed by cooling of lava flows at the earth’s surface).

The next step is to measure the amounts of the parent and daughter isotopes in a sample of the rock unit.

In some cases, the isotopes eject particles, primarily neutrons and protons.The daughter atoms are not lesser in quality than the parent atoms from which they were produced.Both are complete atoms in every sense of the word.Therefore, carbon has three isotopes, which are specified as carbon-12, carbon-13 and carbon-14 (figure 1). Comparison of stable and unstable atoms of the element carbon.They have six protons in their nuclei and six electrons orbiting their nuclei, which gives carbon its chemical properties.

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(These are the moving particles which constitute the radioactivity measured by Geiger counters and the like.) The end result is stable atoms, but of a numbers of protons and electrons.

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