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Atomic Nucleus
Protons and Neutrons packed into a dense core at the center of an atom
Atomic Number
Number of protons in an atom
Mass number
Sum of protons plus neutrons in the nucleus of an atom
Atomic mass
Total mass of an atom. Usually mesured daltons.
Radioactive isotope
Nucleus decays spontaneously, giving off particles and energy. When decay leads to loss of a number of protons, the element changes.
Half-life
Time is takes 50% of the parent isotope to decay
Radiometric dating
Measure the ratio of different isotopes and calculate hie many half-lives have passed since formation.
Energy
Capacity to cause a change by doing work
Potential energy
Energy matter pocesses because of location or structure.
When an electron loses energy, it...
..."falls back" to an electron shell closer to the nucleus.
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