Element having maximum affinity is :
F2
Cl2
Br2
I2
B.
Cl2
Among halogens , the order of elctron affinity is -
Cl > F > Br > I
Unexpectedly , florine has less electron affinity than chlorine .It is due to greater elctron density on F (lesser size) due to which it fends to repel the incoming electron .
Dominance of strong repulsive forces among the molecules of the gas (Z = compressibility factor)
depends on Z and indicated by Z = 1
depends on Z and indicated by Z > 1
depends on Z and indicated by Z < 1
is independent of Z.
How does the ionisation energy of 1st group elements vary ?
Increases down the group
Decreases down the group
Remains unchanged
Variation is not regular