Abstract: According to the crystal model of atomic physics and by using a new theory as well as an interaction potential between atoms, an analytical expression, which is represented by microscopic physical quantities, for Yo ungs modulus of metallic single crystal is given. The values of Youngs moduli of seven-kind metallic single crystals were calculated and consisted with the experimental values.

Key words: logic mechanics, metallic single crystal, Youngs modu lus, potential function, face-centred cubic, binding energy