This process of changing one element (designated as the parent isotope) into another element (referred to as the daughter isotope) is called radioactive decay.
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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).
So, after only half an hour, half the sand should be in the top bowl, and the other half should be in the bottom bowl.
Suppose that a person did not observe when the hourglass was turned over.
Both are complete atoms in every sense of the word.