Assertion: y | /r/HasProperty | trivalent
Facets:
value: almost exclusively
type: DEGREE
Source sentences:
text: One of the few notable differences between the chemistry of yttrium and that of the lanthanides is that yttrium is almost exclusively trivalent, whereas about half the lanthanides can have valences other than three; nevertheless, only for four of the fifteen lanthanides are these other valences important in aqueous solution (CeIV, SmII, EuII, and YbII).