MYTUTOR SUBJECT ANSWERS

7605 views

Why is chlorine more reactive than bromine?

When they react, both chlorine and bromine need to accept an electron into their outer electron shell to complete the shell and form chloride and bromide ions. There are three factors that affect how easily an electron is accepted:

1. The number of protons in the nucleus. Protons are positively charged and attract negatively charged electrons. A bromine atom has 35 protons but a chlorine atom only has 17. This means that a bromine nucleus has a stronger attraction for an electron than a chlorine nucleus.

2. The atomic radius of the atom. The bromine atom has one more electron shell than the chlorine atom. This makes the radius (the distance from the nucleus to the outer shell) of the bromine atom larger than that of the chlorine atom. The bromine nucleus therefore has to attract an electron from further away, and this greater distance means the electron is attracted less strongly.

3. The shielding within the atom. The number of full electron shells between the nucleus and the electron also affects the strength of the attraction – this is called shielding. Because a bromine atom has one more full shell than a chlorine atom, it has more shielding which means the attraction between the nucleus and an electron is weaker.

Although the bromine nucleus is more positively charged than the chlorine nucleus, the increase in the radius and the extra shielding in the bromine atom outweigh this factor, which means that an electron is more easily attracted into the outer shell of a chlorine atom than that of a bromine atom, so chlorine is more reactive.

Emily W. GCSE Biology tutor, GCSE Chemistry tutor, A Level Maths tuto...

1 year ago

Answered by Emily, who has applied to tutor GCSE Chemistry with MyTutor


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

162 SUBJECT SPECIALISTS

£18 /hr

Laura C.

Degree: Chemistry (Masters) - Durham University

Subjects offered: Chemistry, Science+ 3 more

Chemistry
Science
Maths
Biology
-Personal Statements-

“Hello, I'm Laura. I know how hard GCSEs and A Levels are and the stress they can cause. I also know how beneficial having a friendly undestanding person to help can be. For me, that was my sister. For you, I hope that can be me.  I'm...”

£18 /hr

Yosola I.

Degree: Medicine (Bachelors) - Bristol University

Subjects offered: Chemistry, Biology+ 1 more

Chemistry
Biology
-Medical School Preparation-

“Hello! My name is Yosola and I am a medical student. I absolutely love helping others especially when it comes to achieving academic success; hence the reason why I am a tutor! I always aim to do everything to the best of my ability an...”

MyTutor guarantee

£22 /hr

Elizabeth G.

Degree: Mathematics (G100) (Bachelors) - Durham University

Subjects offered: Chemistry, Science+ 2 more

Chemistry
Science
Physics
Maths

“ Hello, my name is Elizabeth, I am studying maths at Durham. I love maths but also studied chemsitry and physcis at A-level. I have two younger sisters who I have helped through similar exams and have tutored various other subjects giv...”

About the author

£18 /hr

Emily W.

Degree: Medicine (Bachelors) - Cambridge 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.”

MyTutor guarantee

You may also like...

Posts by Emily

What is the difference between an artery and a vein?

Why is chlorine more reactive than bromine?

Other GCSE Chemistry questions

What's the difference between ionic and covalent bonds?

How many moles of Magnesium must react with excess Oxygen to produce 80g of Magnesium oxide?

What is the difference between Ionic and Covalent bonding

What is the relative formula mass of CaCO3?

View GCSE Chemistry tutors

Cookies:

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

mtw:mercury1:status:ok