The Periodic Table
Bohr’s theory give a fairy picture of the Hydrogen atom
It can not explain completely, however, the atoms with more than one electron (complications due to the interactions between electrons)
Occupancy of the energy levels by the electrons
- first level: max. 2 electrons
- second level: max. 8 electrons
- third level: max. 8 electrons
- …..(will learn how on….)
atoms in the periodic table arranged after the number of the electrons
chemical properties of atoms are determined by the electrons in their outermost shells
atoms “like” and tend to fill up the outermost shell completely with electrons --> this is the driving force for making molecules
noble elements: the outer shell completely filled with electrons
- inert, no chemical activity (group 8
atoms from group one (alkaline metals)
are very active (tend to give up the single
electron in the outer shell)
atoms from group 7 (also very active)
(tend to receive one electron to fill up
completely the outermost shell)