Chapter 4 Flashcards

1
Q

Cause of chemical coordination?

A

To attain noble gas configuration;
to attain stability

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2
Q

Kossell and Lewis approach

A

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

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3
Q

ionic bond

A

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

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4
Q

Electrovalency

A

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

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5
Q

Variable valency reasons

A

Unstable nature of core;
inert electron pair effect

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6
Q

Factors affecting ionic bond

A

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

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7
Q

properties

A

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

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