Answer
a) Copper ($^{29}$Cu): Metal
b) Selenium ($^{34}$Se): Non-Metal
c) Arsenic ($^{33}$As): Metalloid
d) Chromium ($^{24}$Cr): Metal
Work Step by Step
Refer to the Periodic Table. Elements to the left of the bold line (starting with Boron (B) and stepping down to end with Polonium (Po)/Astatine (At), are metals. Elements on either side of the bold line, with the exception of Aluminum (Al), are Metalloids, and the remaining elements to the right of the Metalloids are Non-Metals.