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I can explain why some nuclei are stable and why some are unstable.
Muuji qoraalka
Protons have a positive electric charge of +1 and a mass number of 1.
Neutrons have no electric charge and have a mass number of 1.
The atomic number of an element equals the number of protons in the nucleus of each atom of that element.
The atomic number of an element equals the number of electrons in each atom of that element.
Atoms of an element that have different numbers of neutrons in their nuclei are isotopes of the element.
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