Why is the first ionisation energy lower in barium compared to calcium?

Barium has more electrons shells than calcium, so the nuclear shielding is stronger, and the outmost electrons are further away from the nucleus. This results in a weaker attractive force between the electron and the nucleus, so a smaller energy is required to remove it. 

JF
Answered by Joseph F. Chemistry tutor

15223 Views

See similar Chemistry A Level tutors

Related Chemistry A Level answers

All answers ▸

What are the different types of isomers?


BeCl2 has a linear shape with a bond angle of 180 degrees, where as H2O has a bent shape with a bond angle of 104.5 degrees. Explain why these molecules have different shapes despite having the same general formula of AB2.


Why is SiO2 a solid whereas CO2 is a gas at room temeperature?


Explain why the 2nd Electron aiffinity of Chlorine is Endothermic whilst the first electron affinity is exothermic


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

MyTutor is part of the IXL family of brands:

© 2025 by IXL Learning