Home Preparation for National Talent Search Examination (NTSE)/ Olympiad
Chapter : 4. Structure Of Atoms
Valence shell
(A) Valence shell The outermost orbit of an atom is called its valence shell. Valence electrons The electrons present in the outermost orbit are called valence electrons. Example. The electronic configuration of lithium is 2, 1 or it may be represented as : K L 2 1 The outermost orbit is L shell and the number of electrons in its valence shell is one. Only the valence electrons of an atom take part in chemical reactions because they have more energy than all the inner electrons of the atom.