For the first time a fundamental property of an atom has been theoretically established, namely the separation of the entire system of its electron levels and sublevels into two mirror-symmetrical groups of systems. Opposite projection signs of the total spin and spins magnetic moments are typical of these groups of systems.

On the basis of a mirror-symmetrical quantum model of an atom, which is proposed in this book, correlations for a number of atomic properties are found, including those of non-discovered elements.

A hypothesis is put forward for a theoretical substantiation of low-energy (non-nuclear) transmutation of atoms, shown by the French scientist Louis Kervran in biological and geological objects. It also concerns atomic transmutations under the effect of electromagnetic radiation.

It is well-known that so far as low-energy transmutations of elements are concerned, there is no well-defined opinion, their possible existence going counter to the universally acknowledged ideas of the present day.

A quantum mirror-symmetrical model of an atom allows to substantiate the mechanism of atomic transmutations based on the proposed hypothesis about a possible existence of quasiatoms in nature.

This hypothesis holds that a quasiatom is a combination of two or more atoms, which manifests the properties of a conventional atom.

The suggested bond energy values in quasiatoms has been theoretically determined. It has been shown that the hypothesis of quasiatoms and quasinuclei existence can be experimentally proved.

The hypothesis of the existence of quasiatoms also can explain a possible mechanism for atomic transmutations in alchemical experiments.

A mirror-symmetrical quantum model of an atom, as well as the hypothesis verification of quasi-atoms existence might provide a basis to develop new approaches to investigation and application of the properties of atoms and nano objects.

December 2008