Meitnerium , darmstadtium and roentgenium are non-metals .
The IUPAC definition defines a transition metal as `` an element whose atom has a partially filled d sub-shell , or which can give rise to cations with an incomplete d sub-shell '' . *Most scientists describe a `` transition metal '' as any element in the d-block of the periodic table , which includes groups 3 to 12 on the periodic table .
Transition metal