Chapter 4 Flashcards
Cause of chemical coordination?
To attain noble gas configuration;
to attain stability
Kossell and Lewis approach
During the formation of chemical molecule an atom loses,gains or shares electron until it acquires stable electronic configuration in its valence shell
ionic bond
Between two atoms is the electrostatic force which holds together the combining atom formed by complete transfer one or more electrons
Electrovalency
Number of electron lost to form positive and a number of electron gain to form Negative Ion.
Variable valency reasons
Unstable nature of core;
inert electron pair effect
Factors affecting ionic bond
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
properties
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