A1C3T1I1N1O1I1D2
11 points
ACTINOID is validvalid
an actinide [n ACTINOIDS]
any element of a group from element number 89 (actinium) to 103 (lawrencium), also ACTINIDE [n -S]
an actinide [n ACTINOIDS]
any element of a group from element number 89 (actinium) to 103 (lawrencium), also ACTINIDE [n -S]