The present work reviews the properties of the neutron-rich isotopes of oxygen, fluorine, neon, sodium, magnesium, sulfur and argon. The changes in nuclear structure appearing as one goes away from the -stability line are discussed in detail. Information is presented on the mass, the radii of nucleon distributions, energy of the excited states of these nuclei, on the possibility of halo formation as well as on the deformation and quantum characteristics of the ground states of different isotopes. The location of the neutron drip line and questions about the stability of nuclides with Z 8 are considered in connection with the weakening or even vanishing of the shell effects at the magic numbers 20 and 28, аnd the discovery of the new neutron magic numbers at N=16 and N=32.

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