Each scientist works with certain information and collects it in the
course of prof- sional activity. In the same manner, the author
collected data for atomic physics and atomic processes. This information
was checked in the course of the author's p- fessional activity and was
published in the form of appendices to the corresponding books on atomic
and plasma physics. Now it has been decided to publish these data
separately. This book contains atomic data and useful information about
atomic particles and atomic systems including molecules, nanoclusters,
metals and condensed s- tems of elements. It also gives information
about atomic processes and transport processes in gases and plasmas. In
addition, the book deals with general concepts and simple models for
these objects and processes. We give units and conversion factors for
them as well as conversion factors for spread formulas of general
physics and the physics of atoms, clusters and ionized gases since such
formulas are used in professional practice by each scientist of this
area.