Which among the following elements have lowest value of IE1 ?
Pb
Sn
Si
C
B.
Sn
The ionisation energy of Tin (Sn) is less than that of lead (Pb) .It is due to the poor sheilding of d - and f - electron in Pb due to which it feels greater attraction from nucleus .
How does the ionisation energy of 1st group elements vary ?
Increases down the group
Decreases down the group
Remains unchanged
Variation is not regular
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.