Explain why the first ionisation energy of Al is less than that of Mg?
The outer electron on aluminium is removed from the 3p sub-level, whereas the outer electron on magnesium is removed from the 3s sub-level.The 3p sub-level is higher in energy than the 3s sub-level.Aluminium's outer electron is further away from the nucleus and less attracted to the nucleus.This means less energy is needed to remove the electron from aluminium.
Related Chemistry A Level answers
All answers ▸Flask Q (volume = 1.00 x 103 cm3 ) is filled with ammonia (NH3) at 102 kPa and 300 K. The tap is closed and there is a vacuum in flask P. (Gas constant R = 8.31 J K−1 mol−1 ) Calculate the mass of ammonia
What chemical tests are appropriate to identify Butanoic acid, Propanal and 2-methyl propan-2-ol?
In the reaction CO(g) + 2H2(g) <--> CH3OH(g), explain why an increase in pressure increases the yield of methanol
State the H-O-H bond angle of a water molecule and explain why this is the case.