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OpenStudy (anonymous):

How many neutrons are in the radioactive isotope ? 40 19 21 20

OpenStudy (anonymous):

@paki

OpenStudy (paki):

Protons: Any atom of lanthanum has 57 protons. Neutrons: Lanthanum has 30 radioactive isotopes with neutron numbers ranging from 60 to 96 but the only stable isotope(139La) has 82 neutrons. Electrons: The number of electrons is normally the same as the number of protons.

OpenStudy (anonymous):

but a b c d

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