Which orbital is non directional?
They are non directional because they are spherical in shape and probability of finding electrons at a particular distance from the nucleus is same in all directions.
Discuss the formation of KCl and CCl4molecules on the basis of electronic theory of valency. Give any two characteristics of ionic and covalent bond.
Ans: The Electronic theory of valency states that atoms of elements(which are not noble gases) tend to acquire the nearest noble gas configuration by either transfer or sharing of electrons.
KCl is an ionic molecule formed as: 19K= 2,8,8,1 17Cl = 2,8,7
Potassium donates the extra valence electron and attains stable configuration of Argon, and Positive charge. Chlorine accepts the electron and also attains the stable configuration of Argon and a negative charge.
Formation of CCl4
6C=2,4 17Cl = 2,8,7 Carbon requires four more electrons for stable configuration. Chlorine too requires one electron in its valence shell to gain stable configuration. So, both carbon and chlorine mutually contribute one electron each, and share it between them. This way, covalent bond is formed.
Characteristics of ionic bond:- It is the electrostatic force of attraction between cation and anion.- It is non-directional.Characteristics of covalent bond:- It is the chargeless sharing of electrons.- It is directional in nature.