Which of the following elements are in order of decreasing atomic radii (size)? A. Cu, Br, Zn

B. He, Ne, Ar

C. Li, Si, Ca

D. Al, Ga, In

i don't see a text, but i am gonna assume this *orbit* the curved path, usually elliptical, described by a planet, satellite, spaceship, etc., around a celestial body, as the sun.

fe 55.85 g/mol and h2o 18.02 g/mol.