| 1.
Relational expression of connection-stick lengths by bond order (reference model) |
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2.
Radius of atom type i in nth-order covalent bond
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3.
Sum of the radius of i and one-half the bonding stick in the nth-order bond |
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4.
Negative ion radius of atom type i |
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5.
Positive ion radius of atom type i  |
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6.
Radius of atom type i connecting a hydrogen atom in hydrogen bond  |
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