# What is the isotope symbol for an atom that contain 2 protons and 1 neutron?

##### 2 Answers

Aug 5, 2018

#### Explanation:

The subscript of 2 represents the two protons the superscript of 3 represents the total mass of 3 2 protons + 1 neutron = 3 amu mass.

Aug 5, 2018

The isotope symbol for helium-3 is

#### Explanation:

Helium-3 contains 2 protons and 1 neutron.

Here's the general formula to write isotope symbols

A Represents the mass number

B represents the atomic number

C Represents the element symbol