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Download Trends in Atomic Size (radius)
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TRENDS IN ATOMIC SIZE (RADIUS) Atoms do not have sharply defined boundaries. We can not directly measure the radius of an atom, but there are ways to estimate the relative size. X-ray Diffraction A technique used for solid crystalline structures Estimated distance between diatomic nuclei Atomic radius is one-half of the distance between the nuclei of two atoms in a diatomic molecule 7 Diatomic Molecules •H •N •O •F • Cl • Br •I Atomic Size • Will generally DECREASE as you move ACROSS a period. • Electrons are being added to the same principle energy level, nuclear charge is increasing attracting the electrons. • Will generally INCREASE as you move DOWN a group. • Electrons are added to successively higher principle energy levels. Nuclear charge is also increasing. +3 +6 +10 +3 +19 +37 Radii Decreases Nuclear Charge Increases Radii Increases Nuclear Charge Increases
