This paper is written in Chinese. It was originally written in Chinese from December of 2017 to March of 2018, and was registered for copyright in the end of March of 2018. In this paper, we originally presented two scientific principles. One is that the chirality (represented by a pair of hands) could be scientifically abstracted to a counterclockwise circle and a clockwise circle corresponding to the right hand and the left hand respectively, and hence should be mathematically expressed as +2π and -2π, ie, chirality=+2π/-2π. The other is that a circle should be divided into 420 degrees instead of the traditional 360 degrees, so the chirality (a pair of hands) should correspond to +420 degrees and -420 degrees or 840 degrees in total, ie, chirality=840°. As there are right-handers and left-handers in human beings, the complete chirality including these two situations (±chirality) should actually correspond to ±2π and ∓2π or ±840 degrees, ie, ±chirality=±840°. The number of 840 can be expressed with its factors in the form of 840=1(2 4 8)(3 5 7), and the products of (2 4 8) times 1 and (3 5 7) or (2 4 8) are called stable numbers of chirality, in which 56 (8×7) is the biggest and most stable. As the atomic nuclei are located in the space or time-space which has the feature of chirality, we suppose that they live in the space of ±840 degrees, so the stable numbers (the magic numbers) in atomic nuclei are products of (2 4 8) times 1 and (3 5 7) or (2 4 6 8), their double numbers and so on, in which the most stable is 56. When the numbers of proton, neutron and total nucleon in atomic nuclei are equal to these stable numbers, these nuclei are stable, so the most stable nuclide is Fe56 and the natural terminus of the atomic elements is the 112th element Cn*. These stable numbers in atomic nuclei correspond to the hands of human beings and to Chinese metrical poetry because they all are derived from the theory of 840 degrees as stated above.