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the first four ionization energies are for 2p4 electronswoh what i do is look for a huge change in the ionisation energy like here it is from 13300 to 71000
so basically the outer shell has 6 electron here cause the when we remove the 7th one is is most probably closer to the nucleus
and from the periodic table this element is in the 6th group
and they have mentioned from Li to Ne so 2nd period
What do you mean ? yes it but where will you get those 2 extra electrons from this is for Ne
the fifth and 6th are for 2s2
the last one is for 1s2
hence such a BIG difference because it is closest to the nucleus
the closer electron to the nucleus the more the IE