MYTUTOR SUBJECT ANSWERS

575 views

What is meant by the 'First Ionisation Energy' of an element?

The ionisation energy of an element is the energy required to remove the one of the outermost electrons from an atom of the element in its gaseous state. 

 This is quite a difficult process to measure the energy requirements for however, so it is usually scaled up to the energy required or enthalpy change to remove one mole of electrons from one mole of atoms of an element in the gaseous state, which allows us to measure it in J mol-1 (Energy released per mole). Although, it is much more usual to see kJ mol-1 used, as working in J mol-1 means using some unnecessarily large numbers.

The first ionisation energy is the energy requirement for a single electron to be removed from the uncharged elemental electronic configuration (i.e. for lithium this would be 1s2 2s1) to give a cation with a +1 charge.

This could also be written as a chemical formula: X(g) -> X+(g) + e-, where ‘X’ is a particular element.

If another electron was removed from this cation, to give a new cation with a +2 charge, the process would be referred to as the second ionisation energy and so on.

The second ionisation energy could be represented by: X+(g) -> X2+(g) + e-

Daniel K. A Level Chemistry tutor, GCSE Chemistry tutor, GCSE Biology...

2 years ago

Answered by Daniel, an A Level Chemistry tutor with MyTutor


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

97 SUBJECT SPECIALISTS

£20 /hr

George N.

Degree: Chemistry (Masters) - York University

Subjects offered:Chemistry, Physics

Chemistry
Physics

“20 year old second year chemistry student at the University of York. Drummer, guitarist, rugby player and radio host who has experience and a love for tutoring.”

£26 /hr

Martyna S.

Degree: Neurotechnology (Masters) - Imperial College London University

Subjects offered:Chemistry, Science+ 4 more

Chemistry
Science
Maths
Biology
.BMAT (BioMedical Admissions)
-Personal Statements-

“PhD candidate in Bioengineering at Imperial College London. Long experience in effective tutoring!”

£22 /hr

Xanthe W.

Degree: Biological Sciences with a Year in Industry/Research (Bachelors) - Imperial College London University

Subjects offered:Chemistry, Maths+ 1 more

Chemistry
Maths
Biology

“Top tutor from the renowned Russell university group, ready to help you improve your grades.”

About the author

Daniel K.

Currently unavailable: for regular students

Degree: Chemistry (MChem, BSc - Integrated Masters) (Masters) - Leeds University

Subjects offered:Chemistry, Biology

Chemistry
Biology

“Top tutor from the renowned Russell university group, ready to help you improve your grades.”

MyTutor guarantee

You may also like...

Posts by Daniel

What is meant by the 'First Ionisation Energy' of an element?

Why does the First Ionisation Energy decrease down a group in the Periodic Table?

Other A Level Chemistry questions

How to we increase the rate of a reaction?

Explain why molecules form a specific 3D structure in space.

Define relative atomic mass.

What is the difference between an ionic and covalant bond?

View A Level Chemistry tutors

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

mtw:mercury1:status:ok