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OpenStudy (anonymous):
An atom has an atomic number of 19 its atomic mass is 39 how many neutrons does it have?
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OpenStudy (unklerhaukus):
the atomic number is the number of protons the mass number is is the sum of the protons and neutrons
OpenStudy (anonymous):
20. 39-19=20
OpenStudy (anonymous):
Mass = Protons + Neutrons Neutorns = Mass - Protons 39 - 19 = 20
OpenStudy (anonymous):
Atomic Mass = protons + neutrons 39 = 19 + neutrons neutrons = 39 - 19 = 20
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