Which list of elements contains only metals?
a. carbon, iodine, tin
b. tin, copper, cesium
c. helium, iron, copper
d. iodine, carbon, argon

The list of elements that contains only metals is B. tin, copper, cesium.
In A, carbon and iodine aren't metals.
In C, helium isn't metal.
In D, neither iodine, carbon, nor argon are metals. 

C) electrons encircling a nucleus with neutrons and protons

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