Question #a157c

1 Answer
anor277
Feb 16, 2017

"Atomic size decreases across a Period............"

Explanation:

Atomic size decreases across a Period, from left to right as we face the Table. Why? Because nuclear charge is VERY imperfectly shielded by partly filled electronic shells, and as the nuclear charge increases, the attractive pull on the valence electrons becomes GREATER. The result? A progressive decrease in atomic radii.

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And you have boron, Z=5, versus oxygen, Z=8. The atomic radius of boron is 85xx10^-12*m; that of oxygen is 60xx10^-12*m. Are these data consistent with the above spray?

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