" Number of valence electrons in carbon is "

The number of valence electrons in carbon atom is

The number of valence electrons in carbon atom is

The number of valency electrons in carbon atom (Z=6) is

Number of valence electrons in O^(2-) is :

The number of valence electrons in Aluminium is

The number of valence electrons in Aluminium is

(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 atomicm number 13 ? Name the valence shell of this atom.