The first ionisation potential is maximum for :
B
N
O
Be
B.
N
Ionisation potential generally increase when we move in a period from left to right but IE1 of N2 is greater than that of O2 .It is due to the more stable (half-filled orbitals) configurations of N .
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