Why does the radius of an atom decrease as you go across (from left to right) a period on the periodic table?
A. because you are adding less energetic electrons
B. because you are adding positively charged protons, which pull in the outer electrons
C. because you are adding more outer level of electrons, decreasing the area in which they can move
D. because you are adding more neutrons, which increases the attraction between proton and electron
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