Assertion: manganese's number | /r/AtLocation | the nucleus of the atom
Facets:
Source sentences:
text: where A is the atomic number indicating the number of protons exist in the nucleus of the atom; N is the atomic mass unit, defined as the ratio of the average mass per atom to 1/ 12 of the atomic mass of carbon-12 in its nuclear and electronic ground state; and Z is the chemical symbol of the element.