#### Answer

Europium; Eu

#### Work Step by Step

An element is defined by the number of protons it has. Thus, we find the element with an atomic number of 63, which is Europium. The symbol is Eu.

Published by
Cengage Learning

ISBN 10:
1285199049

ISBN 13:
978-1-28519-904-7

Europium; Eu

You can help us out by revising, improving and updating this answer.

Update this answerAfter you claim an answer you’ll have **24 hours** to send in a draft. An editor
will review the submission and either publish your submission or provide feedback.