Assertion: ion's number | /r/HasProperty | the same
Facets:
value: in a neutral atom
type: LOCATION
value: usually
type: DEGREE
Source sentences:
text: Usually the number of protons and electrons are the same (in a neutral atom), but if the atom is an ion and has a charge, then the numbers will be different (and the difference will be the ion's charge, positive or negative depending on which number is higher.)