Question

All hydrogen atoms have one proton. If mass number equals the number of protons plus the number of neutrons, how many neutrons does Tritium have?

Answer 1

Tritium has 2 neutrons.
Tritium is an extremely rare isotope of hydrogen with a mass number of 3.
Of the 3 amu that make up tritium, one is a proton, meaning the other 2 must be neutrons.

Answer 2

2

Step-by-step explanation:

Number of neutrons = Mass number - Number of protons

= 3 - 1

= 2