Since the ancient times. because of the great capacıty of their nature, human beıngs always look for the truth, orderlıness and the better; and throughout this process being present both with the help of philosophy and selence, sent an uncountable number of discoveries and inventions on the top i es of maerocosmos. mıcrocosmos. and between two, humanısm and human anatomy; to the pages of selence and technology as a result of extraordlnary efforts.

One of the most beautıful example for the orderliness ıh the nature is no doubt The Periodical Table invented by Dmitri Ivanovich Mendeleyev (1834 -1907) wiîh the contribution of Lothar Meyer. We hope t hat a number of properties of the el emen ts present in this system may be useful for organizations and people concerned in education, science and technology: and for some of the insufficiencies and possible mistakes tike in the resembling books we count on the tolerance of our readers.