# What pieces of information from the periodic table are needed for isotope notation?

Mar 11, 2014

#### Answer:

To write an isotope, you first write the symbol of the element, then you write the atomic number on the bottom left and the mass number on the top left of the symbol.

#### Explanation:

Atomic number, atomic mass and symbol of the element.

When you write an element in isotopic notation, the mass of the isotope is written above the atomic number of the element, then this is followed by the symbol for the element.