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Elements table periodic properties element atomic number mass biology protons has which neutrons period symbol same two most each name Difference between atomic number and mass number Properties of elements
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Atomic notation nuclear protons neutrons electrons nuclei nucleus periodic electron proton calcium nuclide atoms chem configuration identifying spin ucdavis chemwiki .
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Atomic Mass Number | Definition & Characteristics | nuclear-power.com
Properties of Elements | Biology for Non-Majors I
What Is an Atomic Number? Definition and Examples