Chapter 4

Question 1

Cause of chemical coordination?

Answer 1

To attain noble gas configuration;
to attain stability

Question 2

Kossell and Lewis approach

Answer 2

During the formation of chemical molecule an atom loses,gains or shares electron until it acquires stable electronic configuration in its valence shell

Question 3

ionic bond

Answer 3

Between two atoms is the electrostatic force which holds together the combining atom formed by complete transfer one or more electrons

Question 4

Electrovalency

Answer 4

Number of electron lost to form positive and a number of electron gain to form Negative Ion.

Question 5

Variable valency reasons

Answer 5

Unstable nature of core;
inert electron pair effect

Question 6

Factors affecting ionic bond

Answer 6

Low ionization energy of electropositive element;
more negative value of EA of electronegative element ;
LATTICE ENERGY-the amount of energy released when chemical bond is formed size ; high electronegative difference

Question 7

properties

Answer 7

Physical-crystalline solid( due to strong electrostatic force)
high boiling and melting point
hard and brittle nature
soluble in water
electricity molten and aq.state;
reaction fast