Atomic radius is usually inferred from crystallographic data on elemental solids and is a crude measure of the size of the electron cloud around the nucleus. The data below are atomic radii for the elements in the second row of the Periodic Table. Explain the trend.   Li : 0.152 nm Be: 0.113 nm B: 0.088 nm C: 0.077 nm N: 0.075 nm O: 0.066 nm F: 0.058 nm

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