30
38 if you want to include synthetic elements.
They are in the middle of the periodic table. Start from scandium to zinc. and all the way down to lawrencium to unubium.
58
The 3d,4d,5f and 6f elements. This is from Scandium (Sc) to Zinc (Zn) and columns down to Thorium (Th) to Lawrecium (Lr).
there is 7 metals in the periodic table
Group 3-12