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