Respuesta :

Helium is the smallest

Answer: Idoine/I

Cobalt/Co has a radius of 200 pm

Barium/Ba has a radius of 268 pm

Calcium/Ca has a radius of 231 pm

Chlorine/Cl has a radius of 175 pm

Iodine/I has a radius of 140 pm

Therefore the answer is Iodine, I hope this helps!

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