We are being asked to determine the general trend in the atomic radius.
Atomic radius (pl.radii) is defined as half the distance between the nuclei in a molecule of two identical elements (e.g. a diatomic molecule).
Atomic radius generally increases as we move _____.
A) down a group and from right to left across a period
B) up a group and from left to right across a period
C) down a group and from left to right across a period
D) up a group and from right to left across a period
E) down a group; the period position has no effect
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