Explain why the second ionisation energy of boron is higher than the first ionisation energy of boron.

Boron is the 5th element in the periodic table, and has an electron configuration 1s22s22p1. The first ionization energy of Boron is the energy required to remove the single 2p electron, while the second ionization energy of boron is the energy required to remove one of the two 2s electron. If we already have removed the 2p electron, then we are left with a positively charged Boron ion, and it is harder to remove another electron from an already positively charged species. Moreover, the 2s electrons are closer to the nucleus and are held in the atom with a greater force. That is why the second ionization energy of Boron is higher.

Adelina I. GCSE Biology tutor, A Level Chemistry tutor

7 months ago

Answered by Adelina, an A Level Chemistry tutor with MyTutor

Still stuck? Get one-to-one help from a personally interviewed subject specialist


PremiumCharlotte R. GCSE Chemistry tutor, GCSE Geography tutor, Uni Admissio...
View profile
£24 /hr

Charlotte R.

Degree: Natural Sciences (Bachelors) - Durham University

Subjects offered: Chemistry, Geography


“Hi there! I'm Charlie and I'm studying Natural Sciences at Durham University, specialising inChemistry and Earth Sciences. At A Level I got 3 A*s in Chemistry, Geography and Maths from Bedford Modern School andat GSCE I have 12 A* gr...”

Jake G. GCSE Chemistry tutor, A Level Chemistry tutor
View profile
£20 /hr

Jake G.

Degree: Chemistry (Bachelors) - Warwick University

Subjects offered: Chemistry, Physics+ 1 more


“About me: Hi, I’m Jake and I’m a first year undergraduate at the University of Warwick studying Chemistry. As I only finished my A-levels last year, I still have expertise on the A-level syllabus and good exam technique. Due to my col...”

Elspeth B. A Level Chemistry tutor, GCSE Chemistry tutor, GCSE Maths ...
View profile
£20 /hr

Elspeth B.

Degree: Medicine (Bachelors) - University College London University

Subjects offered: Chemistry, Maths+ 1 more


“HiI am a medical student at University College in London where although I left school five years ago I am still having to recall all the basics I learnt in my science GSCE's and A-levels. Therefore I have realised just how important ...”

MyTutor guarantee

About the author

Adelina I. GCSE Biology tutor, A Level Chemistry tutor
View profile
£20 /hr

Adelina I.

Degree: Medicinal and Biological Chemistry (Bachelors) - Edinburgh University

Subjects offered: Chemistry, Biology


“I am a medicinal and biological chemistry student in the University of Edinburgh! Science has always been my passion, and I share equal love for both Chemistry and Biology! I have been a team leader and a tutor before, so I am sure we...”

You may also like...

Other A Level Chemistry questions

Describe two different test tube reactions to identify the following organic compounds: propanal and benzoic acid.

Explain the trend in Ionisation energy when moving across a period and down a group

Why do transition metals form coloured solutions?

How can an aldehyde be distinguished from a ketone?

View A Level Chemistry tutors


We use cookies to improve our service. By continuing to use this website, we'll assume that you're OK with this. Dismiss