# What is an example of an atomic number practice problem?

4. What is the nuclear symbol for this element? Answer: From the periodic table we can see that this element is oxygen, having an atomic number of 8. The nuclear symbol includes the symbol of the element, and its mass number as a superscript in front of the symbol, and the atomic number as a subscript in front of the symbol. The nuclear symbol is $\text{_8^17"O}$.