Why are the atomic radius and the ionic radius difficult to describe?

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the electron configuration that you gave me has 16 electrons ergo it has 16 protons ergo it is the element sulfur.

a pan containing water is placed in a positio n where it is exposed to a 10 mile per hour wind. the pan contains a uniform depth of 1.27 cm of water, is quite wide, and has a length of 2.44 m in the wind direction. the water in the pan is at a constant temperature of 15.5 °c.