Assertion: protactinium | /r/HasAspect | electron
Facets:
Source sentences:
text: Protactinium has 91 protons and electrons; the number of neutrons is different for each isotope: Number of neutrons = Atomic mass of the isotope - 91
text: Protactinium has 91 protons and electrons; the number of neutrons is different for each isotope: Number of neutrons = Atomic mass of the isotope - 91
text: Protactinium has 91 protons and electrons; the number of neutrons is different for each isotope:
text: Protactinium has 91 protons and electrons; the number of neutrons is different for each isotope: Number of neutrons = Atomic mass of the isotope - 91