RADIOACTIVITY.EU.COM

icon THE PHENOMENON

THE PHENOMENON

icon IN DAILY LIFE

IN DAILY LIFE

icon QUESTION OF DOSES

QUESTION OF DOSES

icon AT THE DOCTOR’S

AT THE DOCTOR’S

icon At the laboratory

At the laboratory

icon At the museum

At the museum

icon NUCLEAR ENERGY

NUCLEAR ENERGY

icon RADIOACTIVE WASTE

RADIOACTIVE WASTE

The aim of this web site is to explain radioactivity and its applications to the general public.

In 1869, the Russian chemist Mendeleyev (1834 – 1907) proposes to classify the chemical elements in a periodic table of elements. The classification of elements according to their atomic number shows a clear periodicity of their properties. In 1913, Bohr’s and Rutherford’s works of on the atom and the nucleus explained the periodicity of properties of elements and gave a physical meaning to the atomic number of the periodic table, identifying it both to the number of electrons orbiting around the nucleus and to the number of protons in the nucleus. We now know that a row of the table corresponds to the filling with electrons of the outer shell of atoms. At the end of the row, rare gases are atoms with a shell saturated with electrons, the transition to the next row corresponding to the filling of a new shell with electrons.

Back to glossary