Tritium Is an Isotope of Hydrogen with a Mass Number ${ } _ { 1 } ^ { 1 } \mathrm { H }$

Multiple Choice

Tritium is an isotope of hydrogen with a mass number of 3. Which of the following accurately represents tritium?

A) ${ } _ { 1 } ^ { 1 } \mathrm { H }$
B) ${ } _ { 1 } ^ { 2 } \mathrm { H }$
C) ${ } _ { 1 } ^ { 3 } \mathrm { H }$
D) ${ } _ { 2 } ^ { 1 } \mathrm { H }$
E) ${ } _ { 3 } ^ { 1 } \mathrm { H }$