Why does ionisation energy increase across a period?

As you go across the period, the nuclear charge (or number of protons increase) but the shielding (or the number of shells) stays the same as all of the elements are on the same period. This causes the nuclear attraction between the nucleus (that is positive) and outermost electron (that is negative) to increase, so the distance between them, also called the atomic radius, decreases.This attraction makes it harder to lose that electron and so the energy to remove it (the ionisation energy) increases as you go across the period

Answered by Anjali P. Chemistry tutor

1705 Views

See similar Chemistry A Level tutors

Related Chemistry A Level answers

All answers ▸

Draw [Cu(H2O)6]2+ and explain why is it blue in colour.


Why is benzene more stable than expected?


Define the term relative isotopic mass. (2 Marks)


What evidence is there for delocalisation in benzene?


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences