A1C3T1I1N1O1I1D2S1
12 points
ACTINOIDS is validvalid
ACTINOID, an actinide [n]
ACTINOID, any element of a group from element number 89 (actinium) to 103 (lawrencium), also ACTINIDE [n]
ACTINOID, an actinide [n]
ACTINOID, any element of a group from element number 89 (actinium) to 103 (lawrencium), also ACTINIDE [n]