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CBSE Class 8 Answered

if particles of matter attract each other then why is the interparticle space present in the matter?
Asked by lawislife40 | 09 Aug, 2022, 11:58: AM
answered-by-expert Expert Answer
Dear Student,
 
Particles of matter attract each other because of interatomic attraction force present between them.
But these forces are depend on the type of matter like solid, liquid or gseous.
Attractive inter molecular forces are important when the molecules are fairly close together but not necessarily touching. This corresponds to intermediate separations.
They have fairly long range and are effective over several molecular diameters.
Attractive forces are ineffective when the molecules arc for apart.
This force is maximum in solids as the constituent particles of solids are closely packed.
Therefore they have maximum interatomic force.
In liquids interatomic force is less than that of solids but more than that of gases.
In case of gases interatomic force of attraction is much less so the particles are found at large distances.
 
However, along with interatomic forces of attraction, there are repulsive forces acting on the atoms too.
Repulsive forces are significant when the molecules of matter are close together on average. They are short range interactions even on a scale measured on molecular diameter. 
These forces are significant only when the molecules are almost in contact.
 
Thus, particles of matter have interparticle spaces depend on the type of matter and because of presence of repulsive forces along with ineffective attractive forces when the atoms or molecules are very close. 
 
Answered by | 09 Aug, 2022, 07:32: PM
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