What is the difference between the atomic number and the mass of an element?

The atomic number of an element is the number of protons or electrons present, since the number of protons in an element is equal to the number of electrons. On the other hand, the mass number is the sum of the protons and the neutrons present in the element.

Rebecca K. GCSE Biology tutor, A Level Biology tutor

2 years ago

Answered by Rebecca, who tutored GCSE Chemistry with MyTutor

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


£18 /hr

Sarah L.

Degree: Chemistry (Bachelors) - Liverpool University

Subjects offered: Chemistry, Science+ 1 more


“About Me: I am a Chemistry student at Liverpool University. I have always had a real  passion and love for all things 'science' and hope that my tutorials will instill that love in you, too. I am very patient and friendly. I have been...”

£20 /hr

Mollie S.

Degree: Biomedical Science (Bachelors) - Newcastle University

Subjects offered: Chemistry, Biology


“Hello, Im Mollie and I'm a Biomedical Science student at Newcastle University. I have a strong passion for science that I hope to share through tutoring you. Being in my first year of university, I really understand the importance of ...”

£22 /hr

Hinsum W.

Degree: Medicine (Bachelors) - Edinburgh University

Subjects offered: Chemistry, Maths+ 3 more

-Personal Statements-
-Medical School Preparation-

“Hi, I'm a first year medic at Edinburgh. I've had 7 years' worth of experience teaching children Maths and English and have mentored lower school peers, so I'm bound to have an approach that will suit your learning style!”

About the author

£18 /hr

Rebecca K.

Degree: Biochemistry (Bachelors) - Kings, London University

Subjects offered: Chemistry, Biology


“Biology tutor from King's College London, ready to help you improve your grades.”

MyTutor guarantee

You may also like...

Posts by Rebecca

Explain what is meant by the term dominant allele.

What is the difference between the atomic number and the mass of an element?

Other GCSE Chemistry questions

Why doesn't the concentration of products or reactants change when a reaction is at dynamic equilibrium?

Explain what a hydrocarbon is, and suggest two properties of hydrocarbons that leave a fractioning column near the top.

What are polymers and why are they useful?

Why can metal conduct electricity and heat?

View GCSE 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