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OpenStudy (cat2211):
The mass number for an element with 17 protons and 18 electrons is ?
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OpenStudy (jiteshmeghwal9):
cannot predict it unless u give atomic number of the element or number of neutrons
OpenStudy (marksomeone):
Their is no such thing because that you cant guess it because if an element has 17 protons so it means that the electron of this element is also the same.
OpenStudy (marksomeone):
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