To complete its valence shell it would need 1 more electron and sodium wants to lose 1 electron so, one atom of sodium will give its one extra electron to chlorine. To get 8 electrons in the outermost shell it can lose 1 electron.Д¬hlorine is a non- metal and it has atomic number 17.It is a stable atom therefore the number of electrons in chlorine atom is 17.Д®lectronic configuration of chlorine is:. Therefore, the electronic configuration of sodium is :. Stable means that the atom has not formed an ion yet. In every stable atom the number of electrons is equal to the number of protons. Atomic number is the number of protons present in the nucleus of an atom. Every atom of an element wants to have 8 electrons in its outermost shell/orbits/energy levels excluding some elements like hydrogen and helium because they need 2. Sodium atom has one electron in its outermost shell. Ionic bonds are the bonds which are always formed between a metal and a non-metal. On the other, other hand, there are metals that are bound together by metallic bonding.and even here some metals can be room temperature liquids.what are the examples? 3550# which the individual particles are bound covalently.but the bonding persists over the entire lattice. 1600# or even the diamond structure #(m.p. And the goto example is silicon dioxide #(m.p. On the other hand, there are material that are NON-MOLECULAR, but in which the constituent atoms are bound together by STRONG COVALENT bonds in an infinite array.that persists thruout the entire covalent lattice. Now materials composed of discrete molecules tend to have intrinsically low melting and boiling points, because their molecular, their discrete particle nature, facilitates separation of the individual molecules. Of course it is also repelled by very other ion of the SAME charge, but if you add all the forces of attraction and repulsion up over the entire lattice, which may certainly be done quantitatively, you can get an estimate of the lattice enthalpy.and this is very ATTRACTIVE.

an ionic compound consists of an infinite array of positive and negative ions that are held together by STRONG electrostatic forces.ДЄn isolated ion in the lattice is attracted to every counterion in the lattice by Coulomb's law of electrostatic attraction. Ionic compounds TEND to have high melting and boiling points.why? Because ionic compounds ARE NON-MOLECULAR.i.e.

Ion bonding action