- Electrons arranged around thenucles in the shells of an atom
- Shells number 1,2,3 and so on
- Each shell can occupy acertain number of electrons
- Finding electron configuration
- Find the proton number of the atom
- Find out the numbers of electrons fromthere. (number of protons = number ofelectrons)
- Arrange the electrons in shells. Electronsoccupy the shell closest to the nucleusfirst
- Electrons only start occupying a newshell when the previous one has beenoccupied
- Valence Electrons
- Electrons found in theoutermost occupied shell of anatom
- Outermost shell refers to theshell which is furthest from thenucleus
- Nature of elements can bedetermined by the number ofvalence elctrons
- 1-2 are metallic. Theexception being aluminiumwith 3
- 4-8 are generally non-metallicelements