# How do you determine the atomic number of an element?

##### 1 Answer
Aug 5, 2017

Well, given the element, you take a gander at the Periodic Table......

#### Explanation:

No-one is expected to memorize the Periodic Table at the undergraduate level. The Periodic Table lists $Z$, $\text{atomic number}$, and average isotopic mass for all the 100 or so known elements. A copy of the Periodic Table will be made available in every Chemistry/Fysics exam you sit as an undergrad or 6th form student.