IONISATION ENERGY GO OVERRR

What experimental results is evidence there is sublevels?

The drop in ionisation energy between Group 2 and Group 3, Group 3’s outer shell is in a 2p orbital compared to Group 2’s 2s, is a further distance from the nucleus and experiences more shielding

What experimental results are evidence of existence of electron shells?

There is a large decrease in first ionisation energy between the Group 8 element of one period and the Group 1 element of the following period

Some successive ionisation energies are separated by large jumps

The fact that aluminium’s first ionisation energy is lower than magnesium’s gives evidence that the 3p sublevel...

Has higher energy than the 3s sublevel

Without using reference data, which piece(s) of experimental evidence can be used to determine the number of electrons in the outer shell of an atom?

the number of electrons before the big jump

the total number of successive energies