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Ionic radius

Atomic Radius

Subject: 
Chemistry
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Chemistry
Physics
Quantum chemistry
Chemical properties
Charge carriers
Chemical bonding
ions
Ionization energy
Electronegativity
Periodic trends
Ionic radius
Atomic radius
Technology

Atomic Radius: The atomic radius is the size of the atom of an element. The values decrease. Yes, they both decrease. The atomic radius increases. Yes, but they increase at a slower rate. Ionic Radius: An atom becomes a cation when an atom loses electrons in a reaction. An atom becomes an anion when it gains electrons in a reaction. The cations? values decrease. The anion?s values also decrease. Yes, their trends are the same. The ionic radius value increases. Yes, they also increase. Electronegativity: Electronegativity is the measurement of an element?s tendency to react with electrons in a chemical bond. The values greatly increase. Yes, they both increase. The values slowly decrease. No, because only one number in group 18 is plotted.

Crystalline_Solids

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Chemistry
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Chemistry
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Crystallography
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Diffraction
Condensed matter physics
Optics
Ionic radius
Cubic crystal system
Pauling's rules
Coordination number
Powder diffraction

Crystalline Solids Crystal Lattice ? A 3D array of points where each point has an identical environment. Unit Cell ? The repeating unit (a unit cell is to a crystal, like a ?brick? is in a house). In a given crystal all unit cells are identical. CaF2 Unit Cell Large cation & Large anion r(Cation)/r(Anion) ~0.72 Small cation & Large anion r(Cation)/r(Anion) ~0.3 Cation Anion Anions and cations want to stay in contact with each other, but when the cation becomes much smaller than the anion, anion-anion contacts prevent this. The solution is to lower the coordination number Ionic radii and coordination number Radius Ratio Rules r(cation)/r(anion) Coordination Number Coordination Geometry ? 0.73 8 Cube ? 0.41 6 Octahedron ? 0.22 4 Tetrahedron ? 0.15 3 Trigonal Planar
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