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

2 Answers
Aug 5, 2018

# ""_2^3He#


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.

The isotope symbol for helium-3 is #""_2^3"He"#.


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