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Both are complete atoms in every sense of the word.
Geologists regularly use five parent isotopes to date rocks: uranium-238, uranium-235, potassium-40, rubidium-87, and samarium-147.
So, for example, every carbon atom contains six protons and six electrons, but the number of neutrons in each nucleus can be six, seven, or even eight.
Therefore, carbon has three isotopes (variations), which are specified carbon-12, carbon-13, and carbon-14 (Figure 1).
A child mummy is found high in the Andes and the archaeologist says the child lived more than 2,000 years ago.
To achieve stability, the atom must make adjustments, particularly in its nucleus.This process of changing one element (designated as the parent isotope) into another element (referred to as the daughter isotope) is called radioactive decay.