The electron which is newly added to the atom in the outer most shell of an atom is called the valence electron.
If an atom of an element has 34 electrons in total, then what is the outer most orbit of the atom and the number of valence electrons?
(a) What are valence electrons? Where are valence electrons situated in an atom ?
(b) What is the number of valence electrons in the atoms of an element having atomic number 13 ? Name the valence shell of this atom.