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材料科學(xué)基礎(chǔ) Fundamental of Materials Prof: Tian Min Bo Tel: 62795426 , 62772851 Email: Department of Material Science and Engineering Tsinghua University. Beijing 100084 Lesson two 167。 Atomic bonding ?Ⅰ.Bonding forces and energies FN : force FA : attractive force FR : repulsive force RAN FFF ???? F d rEFor atomic systems: RAN EEE ??Bonding energies: ? Ⅱ.Primary interatomic bonds 1. Ionic bonding Ionic bonding is always found in pounds that are posed of both metallic and nonmetallic elements, elements that are situated at the horizontal extremities of the periodic table. 20221a t t r a c t iv e 4 aeZZF???? 1r e p u l s iv e ??? nanbF120221n e t 4 ????? nanbaeZZF?? Interionic Forces Z1, Z2=