Assertion: protactinium's number | /r/HasProperty | atomic mass of the isotope
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: It was a catchy tune, and ever since, I always seem to remember protactinium is atomic number #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: 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 (chemical symbol Pa, atomic number 91) is a member of the actinide series of chemical elements.
text: protactinium doesn't have any public repositories yet Protactinium (Pa), radioactive chemical element of the actinoid series of the periodic table, rarer than radium; its atomic number is 91.